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8valvegrowl t1_j72c0p4 wrote

I don't really use my heat pumps in the winter for anything but air circulation in my new house. Just my woodstove from Nov to April.

But in the past I've had no issue running my Mitsubishi or others (Fujitsu and LG) down to -10F or -15F, they just heat cycle a lot and use a lot of power, without creating a ton of heat...but no issues beyond that.

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Pen_Active t1_j73s0tz wrote

Is your Mitsubishi a cold-climate model? It should create plenty of heat down to -15 if sized appropriately for the heating load.

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8valvegrowl t1_j73t26u wrote

Yes, it’s an older H2i model and is at my folks camp, which is poorly insulated and was somewhat undersized. I think that generation H2i had a hard shut-off at -13F or -15F. My current house is super well insulated and the Fujitsu compressor is appropriately sized for the four inside heads, and the heat/cool load of the house. I have no doubt it would keep my place comfy in this weather, just at a high electric usage rate. I burn wood as it’s cheaper and my wood stove is modern.

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