Heat transfer coefficient is a U-value which indicates the amount of heat which penetrates a building envelope (e.g. wall, window, roof) due to the difference in temperature on both sides of the envelope. The value of this parameter is given in units of W/(m²-K). It specifies how many watts of heat energy pass through 1 square metre of partitioning at a temperature difference of 1 kelvin. The lower the U-value, the better the thermal insulation of the material or structure. This means less heat loss also in modular homes.
This factor is an important indicator in energy-efficient and passive construction. It influences the thermal efficiency of the building and the heating and cooling costs.
