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Yesterday we had our offer accepted on a house and we're now planning what to do with it. One thing we want to do is improve the efficiency. We're going to add an air source heat pump and a 7kWp solar array, and we're considering internal wall insulation. The house was built in the 70s and has cavity wall insulation. Even so, it has an EPC rating of D (1 point below a C) with the loft fully insulated.
I've just done some simple calcs and the heat loss through the walls, windows, roof and floor with a 30°C temperature difference comes to 3.75kW. Adding 62mm Kingspan plasterboard to half of the internal walls (some rooms we don't want to lose any floor space) and the heat loss comes down to 3.2kW. For the sake of 540W on a really cold night, is it worth the effort?
I've just done some simple calcs and the heat loss through the walls, windows, roof and floor with a 30°C temperature difference comes to 3.75kW. Adding 62mm Kingspan plasterboard to half of the internal walls (some rooms we don't want to lose any floor space) and the heat loss comes down to 3.2kW. For the sake of 540W on a really cold night, is it worth the effort?