Heat losses from an unoccupied house.

Describes the monitoring over a 15-month period of the heat supplied to and heat lost from an unoccupied house in the grounds of the Cement and Concrete Association. The house was sealed to prevent air infiltration and the windows were covered to eliminate heat transfer by radiation between inside andoutside. Finds that heat losses through the house fabric are proportional to U-values and to the time-averaged temperature differential between the insideand outside environment. Comparison between heat input and measured heat loss shows that cold bridges constitute a significant energy drain. Heat losses from the ground floor do not appear to conform with the current methods of estimation. Presently available techniques for calculating the heat losses from houses may be significantly in error.