Ok how about.
Knock a hole in your roof, fill hole with said PV Panels.
Seeing as PV's are at best 20% efficient, the left over energy from the solar radiation could radiate into the house.
This would give you the heat you are after Ben, as well as a bit of electricity on the side.
Jon M
www.otherpower.co.uk
"I am certainly not a perfectionist, the thing is to know where you can take short c