SEER ties directly into how many kilowatt‑hours your AC uses over a summer. The standard formula for estimating annual electricity cost uses SEER explicitly: annual cost ≈ (cooling capacity in BTU/h × operating hours × electricity price per kWh) ÷ (SEER × 1000), as laid out in the Seasonal Energy Efficiency Ratio article on Wikipedia.
That formula might look abstract, so let’s translate it into a clear, Canadian example using round numbers and a national‑average electricity price.
Across Canada, compiled data from major utilities indicates that the average residential electricity price is around CAD 0.168/kWh as of March 2025, which is consistent with the household price reported in GlobalPetrolPrices’ Canada electricity price index. We’ll round that to $0.17/kWh for easier math in examples.
Imagine a 2.5‑ton central air conditioner (about 30,000 BTU/h) running 800 hours per year in a warm Canadian region like southern Ontario or the Lower Mainland of British Columbia.
We can estimate annual cooling cost for two efficiency levels:
Using the SEER cost formula:
Annual cost ≈ (30,000 × 800 × 0.17) ÷ (SEER × 1000)
Over a 12‑year life, that difference is roughly $1,000 in today’s dollars, before factoring in rising electricity rates.
This lines up with a widely cited efficiency example showing that upgrading from SEER 9 to SEER 13 can reduce electricity consumption for cooling by about 30%, because energy use is essentially inversely proportional to SEER (1 − 9/13 ≈ 30%), as illustrated in the Seasonal Energy Efficiency Ratio article on Wikipedia. The exact percentage changes with the pair of ratings, but the principle holds: each step up in SEER trims your kWh for the same comfort.
The financial value of higher SEER depends heavily on your local electricity rate and how much you use air conditioning.
Recent provincial data show very large differences in residential electricity costs. A July 2025 breakdown of all‑in residential rates (energy, delivery, fees) for 1,000 kWh/month shows rates as low as 7.8 cents/kWh in Quebec and as high as 41.0 cents/kWh in the Northwest Territories, with Alberta listed around 25.8 cents/kWh, as summarized in Off‑Grid Solar System’s 2025 provincial electricity rate table. Powerhornet’s national survey similarly highlights both a national average rate and a significant “territorial premium” where residents in some northern jurisdictions pay two to five times more than those in hydro‑rich provinces, according to Powerhornet’s provincial electricity bill breakdown.
That means the same SEER upgrade will pay back faster in a high‑rate province than in a low‑rate one. To illustrate, assume the same 2.5‑ton system and 800 hours/year, but plug in different electricity prices:
The example rates above are drawn from the 1,000 kWh/month cost table in Off‑Grid Solar System’s 2025 provincial electricity rate summary. In Quebec, higher SEER is still helpful, but the savings are modest relative to total household energy costs; in Alberta or the Northwest Territories, those savings can be a major part of your summer bill.
A quick rule of thumb: if your electricity rate is above about 15 cents/kWh and you run AC regularly during the summer, moving from a basic SEER 13–14 unit to a mid‑high SEER 16–18 unit often pays back over the life of the system—especially in warmer, more humid regions.
