Reduced energy use: A cool roof lowers the amount of heat transferred to the building, which allows it to stay cooler and use less energy for air conditioning. In air-conditioned residential buildings, solar reflectance from a cool roof can reduce peak cooling demand by 11–27%. 1
A high solar reflectance, or albedo, is the most important characteristic to understand in terms of how well a cool roof reflects heat from the sun away from a building. A high thermal emittance—how well a cool roof sheds the heat it does absorb—also plays a role, particularly in climates that are warm and sunny.
The higher solar reflectance, the more solar energy is reflected away from the cool roof surface. Some of the solar energy is absorbed by the roof as heat. The higher the thermal emittance, the more of this absorbed heat is radiated away from the roof surface. (Image courtesy of Cool Roof Rating Council.)
In air-conditioned residential buildings, solar reflectance from a cool roof can reduce peak cooling demand by 11–27%. 1 Reduced air pollution and greenhouse gas emissions: By lowering energy use, cool roofs decrease the associated air pollution and greenhouse gas emissions.
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