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Minimum ambient temp to start gshp
I have a 5 year old water furnace gshp in a pa summer house. The house is closed and drained. I'd like to reopen it this month, but the manual says ambient temp has to be above 45 to run the gshp. Ambient temp is 25-30. But this makes no sense to me. Why does it matter the temp of the air blowing across the heat exchanger ? The refrigerant is cooled too much for the cycle to work ? At 25 degrees ?
Thanks for any help.