3 ms·
the devices are now so efficient that they can extract warmth from even freezing outdoor air "Freezing outdoor air" is air at a temperature of 273 degrees Kelv
by simonblack 3y ago
the devices are now so efficient that they can extract warmth from even freezing outdoor air
"Freezing outdoor air" is air at a temperature of 273 degrees Kelvin. It's got plenty of heat in it.
The limiting factor is mainly the design/cost compromises of the heat-exchanger(s) in the heat-pump.