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HSPF2 measures seasonal heating performance; SEER2 measures cooling. Use both without reducing the project to two numbers.
Key decisionDecision: use HSPF2 to compare winter performance and SEER2 for summer, then verify cold-weather capacity.
What the ratings measure
HSPF2 summarizes seasonal heating efficiency. SEER2 summarizes seasonal cooling efficiency. In both cases, a higher value generally indicates better efficiency under test conditions.
What they do not say alone
They do not replace a load calculation, low-temperature capacity or installation quality. Always compare equivalent systems and certified combinations.
A simple reading order
Start with HSPF2 Region V for Canadian conditions, then review SEER2, then return to the home’s actual need.
Official sources
Updated :
Programs and criteria can change. Always verify the official source before making a decision.