I don't know all the details and reasons, because I don't have enough knowledge about heat pumps. But the explanation given was that takes many hours for the wh

I don't know all the details and reasons, because I don't have enough knowledge about heat pumps. But the explanation given was that takes many hours for the whole system to 'warm up' and start working within optimal range. Turning it on and off frequently would actually make it perform worse, wasting more energy than if it's running all the time.