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Old 09-25-17, 02:42 AM   #22
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The COP and amount of heat output are measured/calculated under a certain set of test conditions.
As there test setup likely did mot involve exactly what you are looking at doing then the ratings are meaningless.

My guess is that if inside your house is 20C and the outside air temp is 20C you will likely achieve a COP of 2+ or whatever the rating says.
As the outside temperature falls you will get a lower and lower the COP will also fall until it is cooling not heating the house.
What you need to figure out is what outside temperature this will work down too before becoming useless.

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