This is very reassuring. It's what we're having done next month.
Although of course being in Cumbria, the 'stupidly hot in summer' bit never actually happened.....
The guy before us added a lean-to conservatory some 40 years ago - wood/glass frame, polycarbonate roof. He had a 'gap' made in the back wall (basically enough room for a person to go through - plastic bags in the cavity, no lintel). Anyway - he put a radiator from the house in there. No real...