4 ms·No, they decide how many energy the heat pump currently uses for heating.by tcfhgj 3y agoNo, they decide how many energy the heat pump currently uses for heating.Alupis 3y agoThat means they control how much heat you get. Otherwise, they would always run in a more efficient/lower-energy demand mode... think about it.tcfhgj 3y agoIts only for a restricted time frame