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Mini Split Heat Pumps: Not Significantly More Than You Reasonably Need To Know


							
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If your main heat source is hot water baseboard, heated by oil or gas, there is another down side to heat pumps. New England had a very harsh cold snap a few weeks ago and I went on a call where a customer had their heat lines freeze and split because they were heating the room with the heat pump and the hot water baseboard lines were not running because the air temperature in the room with satisfied with the mini split. Unfortunately the hot water lines to the baseboards in the outside wall got so cold in one room from not running that I had to isolate that zone. When I went there during the cold snap, they were completely frozen solid. I isolated that one zone and will have to go back and repair several splits. I have seen a similar thing happen before when someone was heating the area with a wood stove, the air was warm but the outer edges of the house where piping was got too cold.

That's really useful info, and something I was totally unaware of living in an area without gas boilers or really cold weather, thank you!

Of course whoever installed a water system would assume the heat would be on in cold weather. Were the pipes outside the insulation layer or something? That's really strange--seems like it would be very lossy in normal use.

I have some piping running through my crawlspace under the insulation, and should really improve it on principle despite it never getting cold enough down there to freeze them.