The thing to understand is that whatever energy you put into the heat pump comes out the hot side, PLUS whatever heat it's able to pump out of the air on the cold side. So it will NEVER be less efficient than resistance heat, and will normally be significantly better.
For example, let's say you run your 1500 watt resistance heater for one hour. That's 1.5 kilowatt-hours x 3413 Btu/kw-hr = 5120 Btu.
Now let's say you ran your heat pump long enough to use that same 1.5 kw-hr, and at the particular inside and outside temperature the heat pump has a Coefficient of Performance of 3. You'll get three times as much energy out as energy in. So that 1.5 kw-hr gained you 3 x 5120 = 15,360 Btu.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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