Guide for estimating differences in building heating and cooling energy due to changes in solar reflectance of a low-sloped roof

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Abstract
This guidebook describes a procedure that can be used to estimate changes in heating and cooling costs and the net energy cost difference for a building as a result of changing roof color'', or more technically roof solar reflectance. The cost of heating and cooling a building is affected by roof color. A higher roof solar reflectance reduces the solar energy absorbed by the roof and therefore usually provides a reduction in the cost of air conditioning, while causing heating costs to increase. If the difference between reduced cooling costs and increased heating costs is significant, it can affect the choice of membrane for a new roof or a re-roofed building. This guidebook helps the user estimate this energy cost difference for his particular roof. It also describes how various factors influence potential energy savings and actual roof surface temperatures for different solar reflectances. The guidebook is intended to be used by building owners, roofing contractors, or other interested individuals who wish to evaluate the energy cost impacts of different roof solar reflectances. 31 refs., 15 figs.

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