[shoo_pl]

On principle, yes. There are quirks - the COP is different for lower temperatures, and becomes 1:1 at around 5F (-15C). So preheating the air could improve the effectiveness at low temperatures, and I am guessing it might look like this:

- before: 1kWh in, 1kWh out - after: 1.9kWh in, > 1.9kWh out

However, if it was that simple, I suppose heat pump manufactures would include a pre-heating as built-in feature.

It's very likely that he reduced the energy consumption of heat pump by 50%, but at the same time he uses more than those 50% for mining and has a negative total result that is being offset by the profit from mining itself. Which probably nice for him, but not really for environment :)

[throw0101a]

> There are quirks - the COP is different for lower temperatures, and becomes 1:1 at around 5F (-15C).

It depends on the unit. Some (Mitsubishi FE12NA) have a COP of 1.75 even at -10F / -20C. See Table 6:

* https://www.nrel.gov/docs/fy11osti/52175.pdf

[cgufus]

The used coolant mainly infleunces these numbers.

check chart on: https://www.researchgate.net/figure/Coefficient-of-performan...