My Mitsubishi Ecodan air source heat pump works between -18 to +35°C... https://library.mitsubishielectric.co.uk/pdf/book/PUZ-HWM140VHA_-BS#page-2
Nick Palmer On the side of the Planet - and the people - because they're worth it On Wed, 13 Apr 2022 at 19:41, Jed Rothwell <jedrothw...@gmail.com> wrote: > H LV <hveeder...@gmail.com> wrote: > >> When temperatures fall to 25 to 30 degrees, a heat pump loses its spot as >>> the most efficient heating option for an Atlanta home. >>> >>> >> Apparently heat pumps have improved a lot over the last decade. This >> article says they now work well down to -10F or lower. >> > > I looked at one recently, to replace one of our furnaces. (We have one > heat pump and two furnaces, for reasons beyond the scope of the > discussion.) The ones they sell in Atlanta still cut out below 40 deg F. > However, a Canadian correspondent tells me the ones in Canada use a > geothermal heat sink rather than air. That makes sense. I saw one like that > in Connecticut. If you could tie into underground water or a lake, you > could use one in Antarctica, I suppose. > > Geothermal heat pumps and air conditioners are a lot quieter than air. > > This article describes geothermal heat pumps. It says they are expensive. > I guess the other super-efficient ones are also more expensive which is why > they are not recommended in Atlanta. We seldom have days below 40 deg F. > >
