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SDMCF · 02-25-16, 01:50 AM

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.

02-25-16, 01:50 AM	#1863
SDMCF Apprentice EcoRenovator Join Date: Jul 2014 Location: Finland Posts: 125 Thanks: 5 Thanked 35 Times in 34 Posts	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.