Heat pumps

[Hugh Barnes]

I have a pal with a large house with a ground source heat pump. But, here's the rub, he built his house with that approach to heating built in to the design. The house is very much a passive house, with windows only on the south facade (in the main) etc. His house is always toasty - spome time a little too much!

I think the bottom line is in a new build as part of the design, then it will be very efficient. Retro-fitting to an older house, perhaps not so much...

All of the above very subjective, of course..