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0 pointsjonstewart6y ago0 comments

Mitsubishi and Fujitsu both have models that are rated efficient down to -15F now, with anecdotal reports they can handle -25F.

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3 comments · 2 top-level

nitrogen6y ago· 1 in thread

Can't you also (in new construction or remodels and not in permafrost areas) bury a heat exchanger underground?

D13Fd6y ago

Yes, they call this "geothermal" (although it's not like geothermal power generation). You can also use lakes and large ponds rather than burying it.

I looked into it last year. The main problem is cost (in getting into the ground) and expertise. In my area at least, there are dozens of reasonably solid residential HVAC companies with extensive traditional heat pump experience, and zero with extensive geothermal experience.

D13Fd6y ago

They can be tough to get in some areas though, if you want to use a local supplier. I bought the best modern model available from HVAC companies in my area, and it resorts to backup electrical heat around 15F. But that's still fine for my climate (northeast US).

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