Talking about air conditioner-style heat pumps here, > as soon as you turn it off You're not supposed to turn it off - then the room will get cold again. Spen

Talking about air conditioner-style heat pumps here, > as soon as you turn it off You're not supposed to turn it off - then the room will get cold again. Spending the energy to heat up the whole house and radiator mass is very energy-inefficient. Just leaving the air heat pump on the whole time, letting the thermostat regulate and just heating the air inside the home is more efficient, even though it's "running for longer".