CapnDean Posted February 21, 2022 Share Posted February 21, 2022 2008 Camelot 42PDQ : Hopefully I can articulate well enough. Outside tempertature was 50 degress, went to bed with all three AC units set to Heat Pump. Temperature dropped overnight to the low 20's - Woke up to a cold coach and the AC units silent. I am thinking that they shut down because it was so cold....'there was no heat to pump'. The next night, I set zone 1 to heat pump and zones 2 & 3 to furnace - - same thing, Zone 1 ran and produced heat, I suppose until sometime when the temp dropped really low. When I awakened, we had a toasty bedroom because the furnace (which relies on aquahot on diesel) did it's thing, and again the heat pump remained silent. Anybody know what the outside temp needs to be to shut off the heat pump? Anyway to make it switch from heat pump to furnace on its own? Link to comment Share on other sites More sharing options...
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