Ok, the government Green Homes Grant. It’s £5k or £10k, and for me it’s £10k. You need to spend it on both a primary and secondary element if you want the secondary, and actually all I really want is the secondary, double glazing.
The maths is as follows: my windows will be £10k. If the primary element of the GHG is, say, £6k, then I will get £5k off that and also £5k off the windows, so the net cost is £6k rather than £10k.
The primary elements that could apply to me are solar thermal (solar panels that heat water) and air source heat pumps (basically air conditioning in reverse). I currently have a combi boiler.
Has anyone any experience of either of these two things? I’m leaning towards getting the air source heat pumps, because they can act as air conditioning in summer as well, but the only site available for the units is likely to be in the shade so they won’t do much, and I’m mildly concerned about the noise.