That's interesting information. FWIW The refrigerant in my system is R407C. I have no idea whether that is in any way better or worse.
I may have given the wrong idea when I said that my system just about copes in the coldest conditions. What I mean is that when it is very cold out the heat pump has to work at the limit of how much heat it can extract from the ground. I normally keep its additional resistive heating turned off, and let the GSHP run hard. If that is not sufficient I do turn on the resistive heating function of the GSHP. I don't sit in the cold adding another horse hair shirt and letting the house grow cold.
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