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Electric AUX heat is very inefficient, leave it off unless the heatpump simply can't keep up. When it is around 40 F or colder, the heatpump will run defrost cycles. During that time (1 to 3 minutes)...

The 15 SEER rating of your heatpump isn't the capacity. Maybe you should have gotten a higher BTU heatpump, higher 'ton', a ton being 12,000 BTU/hour.

Yeah the old thermostats and maybe a lot of...

I have a 99 DX with the d16y7 engine, automatic tranny. Tank size is either 10.9 or 11.9, I forget which. I can do a bit more than 300 miles before getting very low, between 32mpg-35mpg doing mostly...

Haha oops! I haven't done that in a long time. Well, still good info for somebody finding this thread from a search engine.

Installing a thermostat with a compressor lock-out when the outside temperature gets to a certain temperature below freezing would not save energy costs, most likely. Heat pumps (if in good working...

With the single stage heat pump, the first stage of heating or cooling would probably provide a higher efficiency ratio than when it is running full bore (stage 2).

Honestly, if they make one, I'd...