4 ms·
It mostly depends on what refrigerant is used. All heat pumps need to be able to change the phase of the refrigerant, which becomes too hard above or below cert
by extrapickles 8y ago
It mostly depends on what refrigerant is used. All heat pumps need to be able to change the phase of the refrigerant, which becomes too hard above or below certain temperatures. You can extend the range by having a higher pressure pump, but that reduces efficiency.