If possible, place the heat pump inside the house in the utility room (ground source or teh indoor module of an air to water)– unlike many others Nibe heat pumps are both quiet enough (and pretty enough!) to allow this. This saves on both installation and also running costs. You can remotely locate the heat pump in a garage etc., but it is not necessary for noise or equipment size reasons – the heat pump’s always going to be more cost effective to run if placed near where it and or the hot water is used.