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Sunday, April 06, 2008

Cooler Roofs

Over 90% of the roofs in the United States are dark-colored. These low-reflectance surfaces reach temperatures of 150 to 190°F (66 to 88°C) and contribute to:

Increased cooling energy use and higher utility bills;
Higher peak electricity demand, raised electricity production costs, and a potentially overburdened power grid;
Reduced indoor comfort;
Increased air pollution due to the intensification of the "heat island effect"; and
Accelerated deterioration of roofing materials, increased roof maintenance costs, and high levels of roofing waste sent to landfills.
In contrast, cool roof systems with high reflectance and emittance stay up to 70°F (39°C) cooler than traditional materials during peak summer weather. Benefits of cool roofs include reduced building heat-gain and saving on summertime air conditioning expenditures. By minimizing energy use, cool roofs do more than save money – they reduce the demand for electric power and resulting air pollution and greenhouse gas emissions.
For more information: Cool Roofs


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