Choosing SEER For Different Canadian Climates

Why SEER Is A “Seasonal” Canadian Metric

Because SEER measures seasonal performance, its actual impact depends on how many hours your AC runs each year. The Business Development Bank of Canada notes that SEER and HSPF are particularly important in Canada because the country experiences both hot summers and cold winters, meaning efficiency in both cooling and heating modes can significantly affect long‑term energy costs, as discussed in the Business Development Bank of Canada glossary entry on the energy efficiency ratio. Natural Resources Canada similarly emphasizes SEER as the key metric on EnerGuide labels for central air conditioners, reinforcing its role in summer performance, as described in Natural Resources Canada’s EnerGuide guide for central air conditioners.

Practically, that means:

• In warmer, more humid regions (southern Ontario, parts of southern Quebec, much of the Prairies, interior and Lower Mainland B.C.), AC may run hundreds of hours per season. Higher SEER can significantly cut your annual kWh.
• In cooler coastal or northern regions (coastal Newfoundland, northern Ontario, much of the territories), AC use can be shorter or occasional. SEER still matters, but extreme ratings may not pay back.

Scenario-Based SEER Guidance By Climate And Rates

Here’s a high‑level framework to help match SEER to your situation. These are not code requirements; they’re practical starting points for conversations with your contractor.

*When comparing SEER2 ratings, remember that SEER2 numbers are usually slightly lower than the old SEER numbers for similar efficiency levels, as explained in the SEER2 program’s About page.