doctor Bob
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sitefive":diqiprgo said:Actually air-air heatpumps here are excellent because it doesn't really gets under -10c ever here , so their COP is always in great range.
and Let's not talk about the costs of setting up air-air heatpump VS traditional heating, If I had a medium sized workshop I would insulate it really well and put up few of them and be done with it!
Not quite sure why you are mentioning Air pumps, they have a fairly low COP compared to GSHP.