deg C	External temperature
		deg C	Temperature inside room
		per hour	Air Changes			Heat
					Temp. on	Loss
	Height	Width	Type	U value	other side	(Watts)
Wall A			Internal brick Internal light block Internal plasterboard External solid masonry External cavity External cavity insulated External cavity modern External timber frame
Window			No window Metal frame single glazed Nonmetal frame single glazed 10mm Double glazing 20mm Double glazing
Wall opp. A			Internal brick Internal light block Internal plasterboard External solid masonry External cavity External cavity insulated External cavity modern External timber frame
Window			No window Metal frame single glazed Nonmetal frame single glazed 10mm Double glazing 20mm Double glazing
Wall B			Internal brick Internal light block Internal plasterboard External solid masonry External cavity External cavity insulated External cavity modern External timber frame
Window			No window Metal frame single glazed Nonmetal frame single glazed 10mm Double glazing 20mm Double glazing
Wall opp. B			Internal brick Internal light block Internal plasterboard External solid masonry External cavity External cavity insulated External cavity modern External timber frame
Window			No window Metal frame single glazed Nonmetal frame single glazed 10mm Double glazing 20mm Double glazing
Ceiling			Ceiling and intermediate floor Roofspace no insulation Roofspace 50mm insulation Roofspace 100mm insulation Roofspace 200mm insulation Thatched roof Flat Roof 50mm insulation Flat Roof 150mm insulation
Floor			Solid concrete Suspended timber
Volume		Loss by Air Changes
Total heat loss of this room (Watts)