The (astro)physicist Sabine Hossenfelder discusses the claim on her channel. She has 1.4 million subscribers. https://youtu.be/TEzsBhJTgpc
harry On Mon, Jul 22, 2024 at 3:42 PM Jed Rothwell <jedrothw...@gmail.com> wrote: > Andrew Meulenberg <mules...@gmail.com> wrote: > > At low external temperatures, many heat pump systems switch over to ohmic >> heating. >> > > I had one that did that at ~40 deg F, here in Atlanta. Which is not very > cold. I think more modern ones go lower. An online source says they go down > to 25 deg F. > > Mine did not have an ohmic heater. It had a conventional natural gas > furnace. An auxiliary furnace. The cheapest model available, because it was > not used often. I think that is the normal configuration. > > (Actually, I had two heat pumps for reasons beyond the scope of the > discussion. Still have one.) > > > Do they turn off the heat pump or do they heat the input to the pump? >> > > The heat pump definitely goes off. I could see the outdoor compressor > stop. The conventional heater takes over. > >
