Heat pumps and noise

[transam]

Ripped out an air source heat pump yesterday

2nd one we have taken out in the last 2 months

Also in the new year a land lord we do a lot of work for is considering taking out 4 in his new build rentals ????

( new build 7 years old )

 

[Rad1o]

And back to the original question after all this rant.

We have a heat pump outside our bedroom window - about 2m into the garden. We hear a faint humming noise even when it is working hard, e.g. when it was -9°C in January. The neighbours do not even know that we have a heat pump. What we do hear is the flow through the pipes as the installer did not bury them into the ground but bracketed them onto the outside walls.
Our house has 15mm pipework, but some new builds have 7 and 8mm pipes with heat pumps.

If you have an poorly insulated house, a heat pump will probably not work well as the temperature gradient / heat loss is quite steep. Insulate your walls first. This is also a bliss for the summers.