Smart Thermostats in a Canadian Winter: Setback Limits, Heat Pump Lockouts, and When They're Worth It

What the device changes on a gas furnace, a cold-climate heat pump, a dual-fuel system, electric baseboards and radiant floors, and the one setting that decides each outcome

Published: October 20, 2026

Fact-checked , including Natural Resources Canada, IESO & Ontario Energy Board

Smart thermostat showing 72°F on a neutral wall.

Credit: Shutterstock

Key Takeaways

•A smart thermostat saves energy the same way a programmable one does: by holding a lower temperature when nobody needs it. The "smart" part mostly decides when to start recovering, and on a heat pump that timing is the whole game.
•It earns its place fastest on electric baseboards and gas furnaces in homes that sit empty during the day, and on electric heat under Ontario's Ultra-Low Overnight plan or Hydro-Québec's Rate Flex D, where timing matters as much as temperature.
•On a cold-climate heat pump, check the outdoor lockout settings before anything else. A factory default can leave the compressor off below about 2°C and hand much of a Canadian winter to the backup heat.

Most people buy a smart thermostat because a utility put a rebate in front of them. The box promises savings. The app promises control. What neither tells you is that the device's value depends almost entirely on the equipment it's wired to.

On a gas furnace, a smart thermostat is a better-behaved programmable thermostat. On electric baseboards, it can be the most useful thing in the house, or the most expensive way to replace a dial, depending on how many rooms you have. On a cold-climate heat pump, it can quietly cancel the savings you bought the heat pump for. The difference comes down to a few settings most owners never open.

This guide is organized around that reality. It starts with what a smart thermostat actually does and what the ENERGY STAR label actually certifies. Then comes a conditions table covering five heating systems, three occupancy patterns and the rate structures Canadians actually pay. After that, one section per system explains the reasoning, and the article closes with the settings to check before you call the installation done. It deliberately skips the brand-by-brand shopping comparison. The question here is narrower and more useful: will this device do anything for your heat?

What a Smart Thermostat Actually Changes

Strip away the app and a smart thermostat does three things a basic programmable thermostat can't. It adjusts the schedule for you, using occupancy sensors, your phone's location or learned patterns. It starts recovery early, working out how long your system needs to reach the next setpoint and firing it up in time. It also reports what the equipment did, including run time, and for heat pumps, how much backup heat ran.

Everything else follows from those three. The energy saving itself still comes from one physical fact: a house that is held cooler loses less heat. A smart thermostat doesn't change your furnace's efficiency or your heat pump's capacity. It changes when and how long the house sits at a lower temperature, and how the equipment behaves on the way back up.

What the ENERGY STAR Label Does and Doesn't Promise

The ENERGY STAR logo on the box is the closest thing to independent evidence most buyers will see, so it's worth knowing what's behind it. Under the ENERGY STAR smart thermostat criteria, each manufacturer runs a year of data from hundreds of its customers' homes through EPA-provided software. To qualify, heating run time must drop by at least 8% at the lower confidence limit of a weighted national average, and by at least 4% for the 20th-percentile home.

Three details matter for a Canadian reader. The sample is a U.S. national one, not Canadian homes in a Canadian winter. The metric is run time, not dollars. And for heat pumps, the amount of electric resistance heat used is a reporting requirement only: the label does not certify that a thermostat avoids backup heat.

Natural Resources Canada administers the program here and describes certified models as having been independently certified, based on actual field data, to deliver energy savings. That is a meaningful floor. It is not a forecast for your house.

Installed Is Not the Same as Configured

Utilities know that a rebated thermostat doesn't always make it onto the wall. In a jurisdictional review prepared for Enbridge Gas, the utility's in-service rate for self-installed smart thermostats was 84.15%, meaning its savings accounting assumes roughly one in six rebated units never goes into service. Being on the wall is only step one. A thermostat running factory defaults on the wrong equipment profile is installed, counted and still not doing its job.

What the ENERGY STAR Label Does and Doesn't Promise

Installed Is Not the Same as Configured

The Worth-It-When Table

Read across your row. The occupancy columns assume the thermostat is configured correctly; the last column names the setting that most often decides whether it is.

Heating system	Out all weekday	Hybrid / partly home	Home all day	How the rate changes the answer	The setting that decides it
Gas forced-air furnace	Worth it: daytime and overnight setback both pay	Worth it if occupancy sensing or geofencing runs the schedule	Marginal: overnight setback only, which a basic programmable already does	Flat gas pricing, so depth and duration are the only levers	Schedule or occupancy detection turned on, with a setback no lower than 17°C
Cold-climate heat pump with electric backup	Worth it only with shallow setbacks (1–2°C) and early recovery	Marginal: hold steady, use it for monitoring and alerts	Worth it for the aux-heat report, not the schedule	Ontario ULO: pre-heat overnight and ease off 4–9 p.m. only if the backup heat stays locked out	Compressor minimum outdoor temperature and aux lockout
Dual fuel (heat pump + gas furnace)	Worth it: automates the switch between fuels	Worth it	Worth it	The changeover temperature is where electricity and gas prices cross, so it moves with your rates	Changeover (compressor minimum / aux lockout) set manually; simultaneous operation disabled
Electric baseboard (line voltage)	Strongest case: room-by-room setback recovers in minutes	Strong: unused rooms stay cool	Moderate: zone the bedrooms and spare rooms	ULO and Rate Flex D reward shifting heat out of peak hours, which is where automation earns its keep	A line-voltage model in each zone you want to control
Hydronic / radiant (boiler or in-floor)	Weak: slow recovery eats the setback	Usually not worth it	Not worth it for savings	Little benefit; recovery can't be timed to a price window reliably	Radiant-aware recovery on (Nest True Radiant), shallow or no setback

The pattern is simple once it's laid out. The faster the system recovers, the more a schedule is worth. Baseboards recover in minutes, gas furnaces in well under an hour, and heat pumps and radiant floors in hours, with the heat pump carrying an extra penalty if recovery falls to backup resistance heat.

Gas Forced-Air Furnaces: The Easy Case

A gas furnace is the system the setback rule was written for. It delivers hot air quickly, recovers from a few degrees of setback fast, and runs at the same efficiency whether it's holding temperature or catching up.

The Canadian benchmark is modest and useful. Natural Resources Canada's homeowner guidance says a drop of 1°C over an eight-hour period can save about 2 percent on heating energy, that turning down is worthwhile if you'll be away more than three or four hours, and that it's generally best not to go below 17°C because of the risk of moisture building up in exterior walls. By that rule of thumb, a household that drops from 21°C to 18°C overnight and again while everyone is at work is in the range of several percent. That's real. It isn't life-changing.

What the Smart Part Adds on a Furnace

A basic programmable thermostat already does the overnight setback. A smart thermostat adds value on a furnace in three specific situations:

Irregular schedules. Shift work, hybrid office days and school pickups break a fixed program. Occupancy sensing and phone geofencing hold the setback when the house is actually empty rather than when a schedule guessed it would be.
People who never programmed the old one. A thermostat that learns, or that prompts you to accept a schedule, beats a programmable one left on "hold."
Monitoring. Run-time reports and filter reminders catch a struggling furnace earlier than a cold room does.

If none of those describe your house, the honest answer is that a smart thermostat on a gas furnace is a convenience purchase with a small efficiency edge.

The Candid Limitation on Savings Numbers

Published Canadian evidence on smart thermostat savings in gas-heated homes is thin, and what exists should make you skeptical of any single percentage. An evaluation commissioned by Ontario's Independent Electricity System Operator of a Kingston utility program found the reported electricity savings were verified at just 25% of what the program had claimed, largely because the deemed savings assumed electric heat in homes that mostly heated with gas. The evaluator's own per-home estimates put electrically heated homes at roughly 839 kWh a year of electricity savings against about 116 kWh for gas-heated homes. The gas savings for those homes weren't part of that electricity evaluation, and the review relied on engineering estimates rather than a billing analysis.

The lesson isn't that smart thermostats don't work. It's that the savings belong to the heating system and the household, not to the device.

If you're replacing a furnace thermostat this fall, pair the job with the rest of the start-of-season checks.

Heating Season Opens October 1: The 45-Minute Furnace Room Check for Canadian Homes

What the Smart Part Adds on a Furnace

A basic programmable thermostat already does the overnight setback. A smart thermostat adds value on a furnace in three specific situations:

Irregular schedules. Shift work, hybrid office days and school pickups break a fixed program. Occupancy sensing and phone geofencing hold the setback when the house is actually empty rather than when a schedule guessed it would be.
People who never programmed the old one. A thermostat that learns, or that prompts you to accept a schedule, beats a programmable one left on "hold."
Monitoring. Run-time reports and filter reminders catch a struggling furnace earlier than a cold room does.

If none of those describe your house, the honest answer is that a smart thermostat on a gas furnace is a convenience purchase with a small efficiency edge.

The Candid Limitation on Savings Numbers

The lesson isn't that smart thermostats don't work. It's that the savings belong to the heating system and the household, not to the device.

If you're replacing a furnace thermostat this fall, pair the job with the rest of the start-of-season checks.

Heating Season Opens October 1: The 45-Minute Furnace Room Check for Canadian Homes

Cold-Climate Heat Pumps: The Setting That Decides Everything

This is the row where a smart thermostat can help the most or cost the most, and where the defaults matter more than the features.

The reason is physics. A heat pump delivers heat gently and recovers slowly. When the room falls well below setpoint, a two-stage thermostat calls the second stage: electric resistance backup, which delivers one unit of heat per unit of electricity, against the several units a heat pump manages in milder weather. Natural Resources Canada is direct about it: its heat pump guidance says to use moderated setbacks of not more than 2°C, or a smart thermostat that switches the system on early in anticipation of recovery. Otherwise the supplementary heat runs until the heat pump catches up, eroding the savings the heat pump was bought for.

Efficiency Nova Scotia gives the same advice in plainer words: lower by 1–2°C at night or when away, avoid deep setbacks like dropping to 15°C, and keep the thermostat in "Heat," not "Auto" or "Emergency Heat."

The operating mistakes that follow from ignoring this are catalogued in a separate guide. This section is about what the thermostat itself controls.

Two Lockouts, One Outcome

Every heat pump thermostat worth installing has two outdoor-temperature thresholds. Most owners never see either:

Compressor minimum outdoor temperature. Below this, the heat pump is not allowed to run at all.
Auxiliary (backup) heat maximum outdoor temperature, often called the aux lockout. Above this, backup heat is not allowed to run at all.

Set well, these two numbers keep a cold-climate heat pump carrying the house deep into winter and hold resistance heat back for genuinely cold days. Set badly, they do the reverse.

Important

On ecobee thermostats, the Compressor Min Outdoor Temperature ships at 35°F (1.7°C) by default, according to ecobee's own support documentation. On a cold-climate heat pump rated to run far below freezing, leaving that default in place means the compressor stops at about 2°C and the backup heat takes over. Ask your installer or the heat pump manufacturer what the equipment is rated for, then change the setting on the thermostat itself.

ecobee's page on reducing auxiliary heat with a heat pump adds two details that matter. Threshold changes must be made on the thermostat and can't be made in the app. And with staging left on "Automatically," a setting called Aux Savings Optimization decides how far the room must fall below setpoint before backup heat is called, from 1.1°C (comfort) to 1.8°C (savings), with 1.6°C as the default.

Google's Nest thermostats handle this with a feature called Heat Pump Balance. Max Comfort generally sets a higher aux lockout, so backup heat comes on sooner and more often. Max Savings keeps it off as much as possible. With the feature switched off, backup heat follows a lockout temperature you set in the Equipment menu.

Honeywell Home's T10 documentation shows the other side of "smart" recovery. Its adaptive recovery uses two ramps on a heat pump with electric backup: the compressor starts first, and backup heat is brought in if the temperature isn't rising fast enough. Early recovery helps, but it doesn't guarantee the backup heat stays off.

Where Installers Usually Set the Aux Lockout

The Northeast Energy Efficiency Partnerships' cold-climate installation guide tells installers to consider an outdoor cutout that keeps central backup heat off between 20 and 35°F, roughly −7°C to +2°C, adjusted for occupant comfort. Treat that as a starting range for a conversation with your installer, not a number to copy. The right lockout depends on the heat pump's rated capacity at low temperatures and on how much heat your house loses.

Sizing decides a lot of this before the thermostat ever gets a vote. An undersized heat pump will call on backup heat no matter how carefully it's programmed.

How to Properly Size a Heat Pump for a Canadian Home

So Is It Worth It on a Heat Pump?

Yes, if you want visibility and are willing to configure it: the aux-heat run-time report is the fastest way to learn whether your heat pump is doing its job. It's also worth it if you're out all day and keep setbacks to 1–2°C with early recovery on. It isn't worth it if the plan is deep night-time setbacks carried over from a gas furnace. On a heat pump, the steadiest schedule is usually the cheapest one.

Where Installers Usually Set the Aux Lockout

Sizing decides a lot of this before the thermostat ever gets a vote. An undersized heat pump will call on backup heat no matter how carefully it's programmed.

How to Properly Size a Heat Pump for a Canadian Home

So Is It Worth It on a Heat Pump?

Dual Fuel: A Price Decision Disguised as a Temperature

A dual-fuel system pairs a heat pump with a gas (occasionally oil or propane) furnace as backup. Here the smart thermostat has a clear job: pick the fuel. Above a changeover temperature the heat pump runs; below it, the furnace takes over.

Two settings decide the outcome.

Simultaneous operation must be off. When fossil fuel is the backup, the heat pump and furnace should not run at the same time. The ecobee setup screen reproduced in a U.S. co-op's dual-fuel configuration guide warns to set it to Disable if natural gas or oil is the aux fuel, "otherwise Heat Pump failure may occur." The same guide keeps the aux maximum at least a few degrees above the compressor minimum so the two thresholds don't overlap.

The changeover temperature is an economic choice, not just a mechanical one. That guide's recommended switch point reflects southern U.S. energy prices. In Canada, the right number is the outdoor temperature at which the heat pump's efficiency falls far enough that gas becomes cheaper per unit of heat, which depends on your local electricity and gas rates and on the heat pump's low-temperature performance. Ask your installer to work it out with your actual rates, and revisit it when rates reset.

Nest owners should note that dual-fuel systems (wires in both W1 and W2) can't use Heat Pump Balance. The lockout has to be set manually in the Equipment menu, which means it only gets set if someone sets it.

Two settings decide the outcome.

Electric Baseboards: Where Setback Pays the Most

Electric baseboards are the best case for setback, for a reason worth understanding. Resistance heat runs at exactly the same efficiency whether it's holding a temperature or catching up. Hydro-Québec puts it plainly: turning the heating back on never uses more electricity than was saved while the heat was off. There's no backup-heat penalty and no slow recovery, and every room is already its own zone.

That makes baseboard homes the one place where a smart thermostat's scheduling can pay without caveats. It also brings the biggest practical catch.

Line Voltage Versus Low Voltage

The thermostats most people picture, such as ecobee, Nest and Honeywell's T-series, are low-voltage (24 V) controls for central systems. They cannot run a baseboard. Baseboards are controlled by line-voltage thermostats, which Natural Resources Canada's efficiency regulations define as devices used with a line voltage of between 120 V and 240 V to switch a resistive heating load. Wall-mounted models made on or after July 1, 2026 must now hold temperature within a 0.5°C differential under a standard based on CSA C828-19. In other words, the precision that used to be a selling point of electronic thermostats is becoming the legal baseline. What a smart model adds on top is scheduling, remote control and automation.

Smart line-voltage models are made for this job, and they come with their own requirements. Mysa's baseboard thermostat, for example, works with 120–240 V baseboards, convectors and fan-forced heaters but needs a neutral or second line wire and is not compatible with 24 V systems, central hydronic systems or electric in-floor heating, which needs a separate product. Hydro-Québec's own guidance on baseboard smart thermostats makes the same point: they work at line voltage, so a device goes in each room.

That makes baseboard homes the one place where a smart thermostat's scheduling can pay without caveats. It also brings the biggest practical catch.

Line Voltage Versus Low Voltage

Tip

You don't have to convert every room at once. Start with the zones that sit empty longest, such as spare bedrooms, a basement office or a guest room, and leave rooms that are always occupied on their existing electronic thermostats.

The Overshoot Myth

A smart schedule on baseboards should aim to reach temperature at wake-up or arrival. Setting 24°C to "heat faster" doesn't work. BC Hydro notes that rooms don't heat up any faster at 24°C than at 21°C; the room just overshoots. BC Hydro contrasts that with heat pumps, where it doesn't recommend night-time or away setbacks at all. It's the same fuel with opposite answers, and the difference is recovery.

Hydronic and Radiant Floors: Usually Not Worth It for Savings

Radiant floors and boiler systems store heat in water, concrete and cast iron. That mass is what makes them comfortable, and it's why setback works poorly. Natural Resources Canada's own setback guidance carves out "some hydronic systems" for exactly this reason.

The best measured evidence comes from the U.S. Department of Energy's Building America program. It found recovery from setback took 6.9 hours in a super-insulated house, 3.4 hours in a house built to a 2009 code and about an hour in an old uninsulated one. It advises against setback for radiant heating, non-modulating boilers and super-insulated homes. It also flags a trap: with outdoor reset controls on a condensing boiler, the home "may never recover from setback" without a bypass control.

That's U.S. research on U.S. houses, but the physics transfers. If your home has in-floor heat or a modern well-insulated envelope, a smart thermostat's schedule will fight the system's thermal mass. Remote access and alerts still have value, especially at a cottage or for a frozen-pipe warning, but the savings case is weak. If you use one, turn on its radiant-aware recovery (Nest calls it True Radiant) and keep setbacks shallow or skip them entirely.

How Your Electricity Rate Changes the Answer

For gas-heated homes, the rate is flat and the only levers are depth and duration. For electrically heated homes in Ontario and Quebec, when you use heat now matters as much as how much, and that is where automation starts to earn its price.

Ontario: Time-of-Use and Ultra-Low Overnight

For prices in effect from November 1, 2025 to October 31, 2026, the Ontario Energy Board's Ultra-Low Overnight plan charges 3.9¢/kWh every night from 11 p.m. to 7 a.m. and 39.1¢/kWh on weekdays from 4 to 9 p.m., a tenfold spread. Standard winter time-of-use pricing is flatter: 9.8¢ off-peak, 15.7¢ mid-peak weekdays 11 a.m. to 5 p.m., and 20.3¢ on-peak weekdays 7 to 11 a.m. and 5 to 7 p.m.

On a baseboard home under ULO, a smart schedule that warms the house toward the top of the comfort band before 4 p.m. and eases off through the on-peak window can move a meaningful share of heating into cheaper hours. On a heat pump, the same strategy only works if the backup heat stays locked out. A 4 p.m. recovery that falls to resistance strips at on-peak prices is the most expensive heat in the province.

Note

The Ontario Energy Board resets regulated electricity prices every November 1. Check the new time-of-use and ULO prices before you build a schedule around them.

These prices also sit alongside other moving parts on an Ontario bill.

Ontario Electricity Bills Get Rare Credit as Global Adjustment Goes Negative for First Time in 19 Years

Quebec: Rate Flex D and the Winter Credit Option

Hydro-Québec's Rate Flex D charges less than the base rate for most of winter and more during peak demand events. Under the Rate Flex D terms, there can be up to 30 events between December 1 and March 31, each lasting four hours in the 6–10 a.m. or 4–8 p.m. window, capped at 120 hours a season. Hydro-Québec offers its Hilo smart thermostats at no cost to Rate Flex D customers, and the system automates the sequence of pre-heating, lowering the setpoint during the event and returning to normal.

This is the clearest Canadian case where a smart thermostat pays for reasons other than setback. Nobody wants to manually pre-heat a house at 4 a.m. on the coldest morning of January. A connected thermostat will.

Smart Thermostat Rebates in 2026

Rebates change the math on the device, not on the savings. Check both the model list and your equipment compatibility before buying.

In Ontario, the Home Renovation Savings program run by Enbridge Gas and Save on Energy currently offers a $125 smart thermostat rebate, either as an instant code before purchase or by uploading a receipt within 60 days. To qualify, you must be an Enbridge Gas customer heating mainly with a gas furnace or boiler, or be on the Ontario grid and heat or cool electrically. You also need to live in a detached, semi-detached, row or mobile home on a permanent foundation and not have received a smart thermostat rebate from these programs before. The eligible list includes line-voltage Mysa and Sinopé models alongside ecobee, Google Nest, Honeywell Home and Copeland Sensi. Enbridge's own rebates page still advertises a smaller amount; the program page is the one to trust.

In the B.C. Interior, FortisBC's instant rebates run until October 31, 2026: up to $100 on one ENERGY STAR connected thermostat for gas or electricity customers, and up to $40 per connected baseboard thermostat (up to five) for FortisBC electricity customers.

In Quebec, the Hilo offer described above replaces a rebate with a free device tied to a rate choice.

For Ontario homeowners combining a thermostat rebate with insulation or heat pump incentives, the rules on what stacks are worth reading first.

Stacking Home Renovation Rebates in Ontario: What Combines and What Cancels Out (2026)

Rebates change the math on the device, not on the savings. Check both the model list and your equipment compatibility before buying.

In Quebec, the Hilo offer described above replaces a rebate with a free device tied to a rate choice.

For Ontario homeowners combining a thermostat rebate with insulation or heat pump incentives, the rules on what stacks are worth reading first.

Stacking Home Renovation Rebates in Ontario: What Combines and What Cancels Out (2026)

The Settings to Check Before You Call It Done

A smart thermostat left on its defaults is a guess. Screenshot this table and work down your row.

System	Check before you call it done
Every system	Equipment profile matches what's in your basement (furnace, heat pump, dual fuel, boiler or baseboard). Schedule or occupancy detection turned on, not permanent "hold." Setbacks at or above 17°C.
Cold-climate heat pump with electric backup	Compressor minimum outdoor temperature set to the heat pump's rating (ecobee ships at 1.7°C). Aux lockout set so backup heat can't run on mild days (ecobee: Aux Heat Max Outdoor Temperature; Nest: Heat Pump Balance or a manual lockout). Setbacks of 1–2°C with early recovery on. "Heat" mode, not "Auto" or "Emergency Heat." Aux-heat run time reviewed after the first cold week.
Dual fuel	Heat pump and furnace simultaneous operation disabled. Changeover temperature set from your local gas and electricity prices, not a U.S. default.
Electric baseboard	Line-voltage models rated for each heater's wattage and wiring. Schedule reaches temperature at wake-up and arrival without overshooting. On ULO or Rate Flex D, heating shifted out of the peak windows.
Hydronic / radiant	Radiant-aware recovery turned on. Setbacks shallow or skipped; device used for remote access and low-temperature alerts.

For the heat pump owner, the first cold snap is the real test. Knowing what normal winter behaviour looks like makes the thermostat's reports easier to read.

What to Expect From a Heat Pump in a Canadian Winter: Comfort, Capacity, Noise, Ice, and When to Use Backup Heat

About the Author

Ryan May

Senior Contributor / Founder

Ryan is the founder of Homeowner.ca and a proud Canadian homeowner based in Guelph, Ontario. Over his 25-year career in digital publishing, he has focused on transforming complex information into clear, practical guidance that helps people make confident, well-informed decisions.

Meet Our Team Editorial Standards

FAQ

On a gas furnace, only a little: you still get an overnight setback, which a basic programmable thermostat also provides. On electric baseboards it can still help by keeping unused rooms cooler. On a time-of-use or ULO plan, it can shift heating out of peak hours even if someone is always home.

It can be, as long as recovery happens early and on the compressor. Natural Resources Canada recommends no more than 2°C. If your thermostat's reports show backup heat running every morning, reduce the setback or remove it.

Auxiliary heat runs alongside the heat pump when it can't keep up, and that's normal on very cold days. Emergency heat shuts the heat pump off entirely and runs only the backup. It's meant for when the outdoor unit is out of service, not for everyday use.

No. Those are low-voltage (24 V) thermostats for central systems. Baseboards need line-voltage (120–240 V) thermostats, installed one per heater zone, and you should check wattage and wiring requirements before buying.

Line-voltage thermostats switch 120–240 V household circuits, so installing one is electrical work. Check your province's rules on homeowner electrical work and permits, and hire a licensed electrician if you aren't qualified or if the wiring doesn't include the neutral or second line wire the thermostat requires.

No. ENERGY STAR certifies an average reduction in heating run time across a U.S. national sample. For heat pumps, backup resistance heat use is reported, not capped. The lockout settings are still yours to configure.

Natural Resources Canada advises staying at or above 17°C in general because of the risk of moisture building up in exterior walls. For longer absences it says humidity must be kept low if you go lower. On a heat pump, a deep setback also means a long, expensive recovery when you get back.

Mainly for control and alerts, not savings. Radiant systems recover too slowly for schedules to pay reliably. If you use one, turn on radiant-aware recovery and keep setbacks shallow.

There isn't one right number for Canada. It should be the outdoor temperature where your heat pump's cost per unit of heat rises above your furnace's, which depends on your local electricity and gas prices and the heat pump's cold-weather performance. Ask your installer to calculate it with your rates.

The Home Renovation Savings rebate is limited to households that haven't previously received a smart thermostat rebate, discount or device from Enbridge Gas, Save on Energy or the program, so plan on one.

Sources

Natural Resources Canada. (2025). Keeping The Heat In – Section 9: Operating your house: thermostats, water heaters, furnaces and other heating/cooling systems. Retrieved from https://natural-resources.canada.ca/
Natural Resources Canada. (2025). Heating and cooling with a heat pump. Retrieved from https://natural-resources.canada.ca/
Natural Resources Canada. (2025). Smart Thermostats (ENERGY STAR Canada). Retrieved from https://natural-resources.canada.ca/

Show 20 more sources

Natural Resources Canada. Line Voltage Thermostats – Energy Efficiency Regulations. Retrieved from https://natural-resources.canada.ca/
ENERGY STAR (U.S. Environmental Protection Agency). Smart Thermostats Key Product Criteria. Retrieved from https://www.energystar.gov/
NMR Group for the Independent Electricity System Operator. (2021). Utilities Kingston/Kingston Hydro Smart Thermostat Program Evaluation Report. Retrieved from https://www.ieso.ca/
Guidehouse for Enbridge Gas. Jurisdictional Review: Smart Thermostat In-Service Rate (ISR). Retrieved from https://engagewithus.oeb.ca/
ecobee. Reduce your Auxiliary Heat usage in a Heat Pump Configuration. Retrieved from https://support.ecobee.com/
ecobee. Threshold settings for ecobee thermostats. Retrieved from https://support.ecobee.com/
Google Nest Help. Heat Pump Balance. Retrieved from https://support.google.com/
Resideo (Honeywell Home). T10 & T10+ Pro Smart Thermostat with RedLINK 3.0 User Guide (33-00428). Retrieved from https://customer.resideo.com/
Northeast Energy Efficiency Partnerships. Guide to Installing Air-Source Heat Pumps in Cold Climates. Retrieved from https://neep.org/
Advanced Energy / Berkeley Electric Cooperative. ecobee SmartThermostat Setup Guidelines for Heat Pumps with Gas Furnace Backup (Dual Fuel). Retrieved from https://www.berkeleyelectric.coop/
Efficiency Nova Scotia. Getting the Most Out of Your Heat Pump: What You Need to Know. Retrieved from https://www.efficiencyns.ca/
BC Hydro. (2021). Cranking up the heat warms a home faster, and other heating myths debunked. Retrieved from https://www.bchydro.com/
U.S. Department of Energy, Building America (CARB). (2014). Hydronic Systems: Designing for Setback Operation. Retrieved from https://www.energy.gov/
Mysa. Smart Thermostat for Electric Baseboard Heaters. Retrieved from https://getmysa.com/
Hydro-Québec. Turning the Heat Down Then Back Up: Is It Really Worth It? Retrieved from https://www.hydroquebec.com/
Hydro-Québec. Understanding smart thermostats. Retrieved from https://www.hydroquebec.com/
Hydro-Québec. Rate Flex D: Save up to 20% on your electricity bill. Retrieved from https://www.hydroquebec.com/
Ontario Energy Board. Electricity rates. Retrieved from https://www.oeb.ca/
Home Renovation Savings (Enbridge Gas and Save on Energy). Get a $125 smart thermostat rebate. Retrieved from https://www.homerenovationsavings.ca/
FortisBC. Instant rebates on energy-efficient products. Retrieved from https://www.fortisbc.com/

Smart Thermostats in a Canadian Winter: Setback Limits, Heat Pump Lockouts, and When They're Worth It

What the device changes on a gas furnace, a cold-climate heat pump, a dual-fuel system, electric baseboards and radiant floors, and the one setting that decides each outcome

Published: October 20, 2026

Fact-checked , including Natural Resources Canada, IESO & Ontario Energy Board

Key Takeaways

•A smart thermostat saves energy the same way a programmable one does: by holding a lower temperature when nobody needs it. The "smart" part mostly decides when to start recovering, and on a heat pump that timing is the whole game.
•It earns its place fastest on electric baseboards and gas furnaces in homes that sit empty during the day, and on electric heat under Ontario's Ultra-Low Overnight plan or Hydro-Québec's Rate Flex D, where timing matters as much as temperature.
•On a cold-climate heat pump, check the outdoor lockout settings before anything else. A factory default can leave the compressor off below about 2°C and hand much of a Canadian winter to the backup heat.

Heating system

Out all weekday

Hybrid / partly home

Home all day

How the rate changes the answer

The setting that decides it

Gas forced-air furnace

Worth it: daytime and overnight setback both pay

Worth it if occupancy sensing or geofencing runs the schedule

Marginal: overnight setback only, which a basic programmable already does

Flat gas pricing, so depth and duration are the only levers

Schedule or occupancy detection turned on, with a setback no lower than 17°C

Cold-climate heat pump with electric backup

Worth it only with shallow setbacks (1–2°C) and early recovery

Marginal: hold steady, use it for monitoring and alerts

Worth it for the aux-heat report, not the schedule

Ontario ULO: pre-heat overnight and ease off 4–9 p.m. only if the backup heat stays locked out

Compressor minimum outdoor temperature and aux lockout

Dual fuel (heat pump + gas furnace)

Worth it: automates the switch between fuels

Worth it

The changeover temperature is where electricity and gas prices cross, so it moves with your rates

Changeover (compressor minimum / aux lockout) set manually; simultaneous operation disabled

Electric baseboard (line voltage)

Strongest case: room-by-room setback recovers in minutes

Strong: unused rooms stay cool

Moderate: zone the bedrooms and spare rooms

ULO and Rate Flex D reward shifting heat out of peak hours, which is where automation earns its keep

A line-voltage model in each zone you want to control

Hydronic / radiant (boiler or in-floor)

Weak: slow recovery eats the setback

Usually not worth it

Not worth it for savings

Little benefit; recovery can't be timed to a price window reliably

Radiant-aware recovery on (Nest True Radiant), shallow or no setback

System

Check before you call it done

Every system

Equipment profile matches what's in your basement (furnace, heat pump, dual fuel, boiler or baseboard). Schedule or occupancy detection turned on, not permanent "hold." Setbacks at or above 17°C.

Cold-climate heat pump with electric backup

Compressor minimum outdoor temperature set to the heat pump's rating (ecobee ships at 1.7°C). Aux lockout set so backup heat can't run on mild days (ecobee: Aux Heat Max Outdoor Temperature; Nest: Heat Pump Balance or a manual lockout). Setbacks of 1–2°C with early recovery on. "Heat" mode, not "Auto" or "Emergency Heat." Aux-heat run time reviewed after the first cold week.

Dual fuel

Heat pump and furnace simultaneous operation disabled. Changeover temperature set from your local gas and electricity prices, not a U.S. default.

Electric baseboard

Line-voltage models rated for each heater's wattage and wiring. Schedule reaches temperature at wake-up and arrival without overshooting. On ULO or Rate Flex D, heating shifted out of the peak windows.

Hydronic / radiant

Radiant-aware recovery turned on. Setbacks shallow or skipped; device used for remote access and low-temperature alerts.

Natural Resources Canada. Line Voltage Thermostats – Energy Efficiency Regulations. Retrieved from https://natural-resources.canada.ca/
ENERGY STAR (U.S. Environmental Protection Agency). Smart Thermostats Key Product Criteria. Retrieved from https://www.energystar.gov/
NMR Group for the Independent Electricity System Operator. (2021). Utilities Kingston/Kingston Hydro Smart Thermostat Program Evaluation Report. Retrieved from https://www.ieso.ca/
Guidehouse for Enbridge Gas. Jurisdictional Review: Smart Thermostat In-Service Rate (ISR). Retrieved from https://engagewithus.oeb.ca/
ecobee. Reduce your Auxiliary Heat usage in a Heat Pump Configuration. Retrieved from https://support.ecobee.com/
ecobee. Threshold settings for ecobee thermostats. Retrieved from https://support.ecobee.com/
Google Nest Help. Heat Pump Balance. Retrieved from https://support.google.com/
Resideo (Honeywell Home). T10 & T10+ Pro Smart Thermostat with RedLINK 3.0 User Guide (33-00428). Retrieved from https://customer.resideo.com/
Northeast Energy Efficiency Partnerships. Guide to Installing Air-Source Heat Pumps in Cold Climates. Retrieved from https://neep.org/
Advanced Energy / Berkeley Electric Cooperative. ecobee SmartThermostat Setup Guidelines for Heat Pumps with Gas Furnace Backup (Dual Fuel). Retrieved from https://www.berkeleyelectric.coop/
Efficiency Nova Scotia. Getting the Most Out of Your Heat Pump: What You Need to Know. Retrieved from https://www.efficiencyns.ca/
BC Hydro. (2021). Cranking up the heat warms a home faster, and other heating myths debunked. Retrieved from https://www.bchydro.com/
U.S. Department of Energy, Building America (CARB). (2014). Hydronic Systems: Designing for Setback Operation. Retrieved from https://www.energy.gov/
Mysa. Smart Thermostat for Electric Baseboard Heaters. Retrieved from https://getmysa.com/
Hydro-Québec. Turning the Heat Down Then Back Up: Is It Really Worth It? Retrieved from https://www.hydroquebec.com/
Hydro-Québec. Understanding smart thermostats. Retrieved from https://www.hydroquebec.com/
Hydro-Québec. Rate Flex D: Save up to 20% on your electricity bill. Retrieved from https://www.hydroquebec.com/
Ontario Energy Board. Electricity rates. Retrieved from https://www.oeb.ca/
Home Renovation Savings (Enbridge Gas and Save on Energy). Get a $125 smart thermostat rebate. Retrieved from https://www.homerenovationsavings.ca/
FortisBC. Instant rebates on energy-efficient products. Retrieved from https://www.fortisbc.com/

Smart Thermostats in a Canadian Winter: Setback Limits, Heat Pump Lockouts, and When They're Worth It

Key Takeaways

What a Smart Thermostat Actually Changes

What the ENERGY STAR Label Does and Doesn't Promise

Installed Is Not the Same as Configured

What the ENERGY STAR Label Does and Doesn't Promise

Installed Is Not the Same as Configured

The Worth-It-When Table

Gas Forced-Air Furnaces: The Easy Case

What the Smart Part Adds on a Furnace

The Candid Limitation on Savings Numbers

What the Smart Part Adds on a Furnace

The Candid Limitation on Savings Numbers

Cold-Climate Heat Pumps: The Setting That Decides Everything

Two Lockouts, One Outcome

Where Installers Usually Set the Aux Lockout

So Is It Worth It on a Heat Pump?

Where Installers Usually Set the Aux Lockout

So Is It Worth It on a Heat Pump?

Dual Fuel: A Price Decision Disguised as a Temperature

Electric Baseboards: Where Setback Pays the Most

Line Voltage Versus Low Voltage

Line Voltage Versus Low Voltage

The Overshoot Myth

Hydronic and Radiant Floors: Usually Not Worth It for Savings

How Your Electricity Rate Changes the Answer

Ontario: Time-of-Use and Ultra-Low Overnight

Quebec: Rate Flex D and the Winter Credit Option

Smart Thermostat Rebates in 2026

The Settings to Check Before You Call It Done

FAQ

Sources

Related Reading

Thermostat Setback Mistakes That Trigger Backup Heat in a Canadian Winter (And What To Do Instead)

Best Smart Thermostats in Canada in 2026: Ratings, Rebates, and Picks

What to Expect From a Heat Pump in a Canadian Winter: Comfort, Capacity, Noise, Ice, and When to Use Backup Heat

Switching to a Heat Pump Instead of an Air Conditioner in Canada: A Complete Homeowner’s Guide

Winter Heat Pump Safety Checklist for Canadian Homes: Defrost Water, Ice Hazards, Clearances, and When to Shut It Down

Smart Sprinkler Controllers: Saving Water (and Money) Through Canadian Summers

Ottawa's $2-Billion Heat Pump Rebate Pays Up to $10,000 When Your Furnace Dies: What To Know About Applying

How to Properly Size a Heat Pump for a Canadian Home

Smart Thermostats in a Canadian Winter: Setback Limits, Heat Pump Lockouts, and When They're Worth It

Key Takeaways

What a Smart Thermostat Actually Changes

What the ENERGY STAR Label Does and Doesn't Promise

Installed Is Not the Same as Configured

What the ENERGY STAR Label Does and Doesn't Promise

Installed Is Not the Same as Configured

The Worth-It-When Table

Gas Forced-Air Furnaces: The Easy Case

What the Smart Part Adds on a Furnace

The Candid Limitation on Savings Numbers

What the Smart Part Adds on a Furnace

The Candid Limitation on Savings Numbers

Cold-Climate Heat Pumps: The Setting That Decides Everything

Two Lockouts, One Outcome

Where Installers Usually Set the Aux Lockout

So Is It Worth It on a Heat Pump?

Where Installers Usually Set the Aux Lockout

So Is It Worth It on a Heat Pump?

Dual Fuel: A Price Decision Disguised as a Temperature

Electric Baseboards: Where Setback Pays the Most

Line Voltage Versus Low Voltage

Line Voltage Versus Low Voltage

The Overshoot Myth

Hydronic and Radiant Floors: Usually Not Worth It for Savings

How Your Electricity Rate Changes the Answer

Ontario: Time-of-Use and Ultra-Low Overnight

Quebec: Rate Flex D and the Winter Credit Option

Smart Thermostat Rebates in 2026

The Settings to Check Before You Call It Done

FAQ

Sources

Related Reading

Thermostat Setback Mistakes That Trigger Backup Heat in a Canadian Winter (And What To Do Instead)

Best Smart Thermostats in Canada in 2026: Ratings, Rebates, and Picks

What to Expect From a Heat Pump in a Canadian Winter: Comfort, Capacity, Noise, Ice, and When to Use Backup Heat

Switching to a Heat Pump Instead of an Air Conditioner in Canada: A Complete Homeowner’s Guide

Winter Heat Pump Safety Checklist for Canadian Homes: Defrost Water, Ice Hazards, Clearances, and When to Shut It Down

Smart Sprinkler Controllers: Saving Water (and Money) Through Canadian Summers