Not quite the correct thread, but I'm having a minor heat pump debate this morning elsewhere with a couple of ASHP-sceptics (aka haters), including an engineer who says they have installed 5 and all are unhappy customers.    We have installed 5 in domestic new build properties, all had a plant room to accommodate all the equipment required, the cost was between £15-£20,000, the users are disappointed with the heat provided so far and that will only get worse as the days get colder. Cur