5 Feb
2023
5 Feb
'23
2:17 a.m.
On Sun, 5 Feb 2023 at 07:50, Chris Adams <cma@cmadams.net> wrote:
Electric heat pumps are great for power efficiency until the temperature drops and they switch over to pure electric heat.
Here is graph from popular air heat pump Mitsubishi MSZ/MUZ 25 https://scanoffice.fi/wp-content/uploads/2022/09/rw-vtt-tuntikeskiarvo.jpg https://scanoffice.fi/wp-content/uploads/2022/09/rw-vttn-testitulos.png At -30c external, with +20c internal the units produce heat at approximately 2x of the electric input. But many other units do not perform that well even at -20c external. And these units are premium priced. Modern R32 units consistently outperform old R410A units. -- ++ytti