That looks cool. I will have to look into it further. All ASHPs have the same problem of working down to -15C or so although there is not much moisture in the air at that temp.
What is the spacing between fins on your unit? Can the Debron 1052 fit?
Measuring temps is not that hard with thermisters and most of the HPs I see have them installed plus all the outdoor reset systems use them so it is a known technology. I would like to figure out the programming to have it as a couple of inputs on a PLC and do away with a separate circuit.
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