On Tue, Apr 12, 2022 at 1:23 PM Jed Rothwell <jedrothw...@gmail.com> wrote:
> H LV <hveeder...@gmail.com> wrote: > > However, there has been a big push to instead choose more efficient heat >> pumps. The Canadian Institute for Climate Choices report found that to >> drive deeper emissions cuts, the switch to heat pumps "would play an >> essential and growing role."" >> > > As I said, I am surprised heat pumps work effectively in Canada. It seems > too cold. I think my heat pump in Atlanta cuts out below 40 deg F, and the > aux gas heater comes on. See: > > > https://www.estesair.com/blog/at-what-temperature-does-a-heat-pump-quit-working-efficiently > > Heat pumps do not operate as efficiently when temperatures drop to between > 25 and 40 degrees Fahrenheit for most systems. > > A heat pump works best when the temperature is above 40. Once outdoor > temperatures drop to 40 degrees, heat pumps start losing efficiency, and > they consume more energy to do their jobs. 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. https://rmi.org/heat-pumps-a-practical-solution-for-cold-climates/ Harry
