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DifferenceMore5431 t1_j6eets4 wrote

...but that's exactly what the Energy Star tests are for, so you can compare the actual difference. How could anyone get data like that in their house?

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metalandmeeples OP t1_j6efnk6 wrote

Energy Star reports simply list SEER/EER and HSPF. Heat pumps perform differently depending on the outdoor temperature. When I was sizing heat pumps for my Portland house I used degree-days data along with the Energy Star rating of my existing boiler and the setting of my thermostat to determine how many BTUs I used. Any response I get here might be anecdotal, but the response could still be cross-referenced against degree-days data.

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