Living Green

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Heating and Cooling

Air leakage is a major health and environmental problem for homes. It can contribute up to 30 percent of cooling and heating costs, create comfort and moisture problems, pull mold into buildings, and serve as an easy access for insects. There are many ways to reduce the amount of conditioned air that is lost, and at the same time decrease the amount of energy spent to heat and cool your home.

Air Leaks

Programmable Thermostats

Passive Cooling

Windows
Windows can account for 10 to 25 percent of your home's heating bill. During the summer, windows make the A/C work two to three times harder by letting in the sun's heat. There are measures you can take to reduce heat gain in your home:

Install screens over all windows and doors so they can be left open for cross-ventilation.
Add overhangs to the outside of windows to control the sun's direct radiation.
Use exterior shading devices such as awnings and shutters, which block direct sunlight and can reduce heat gain by 65 percent.
Install shades, drapes, or blinds to reflect heat away from the house. Lighter colors (especially white) work best.
Close curtains on the windows during the day to reduce solar gain. Reflective coatings also cut glare and reduced fading of drapes and furniture.
Apply sun-control or reflective films on south-facing windows to reduce solar gain.
If you plan on replacing single-pane windows, consider energy efficient double-paned ones.
- For more information, visit the Florida Solar Energy Center

Roofing Materials
Energy savings are strongly influenced by the solar reflectivity of the roofing materials. A recent study by Florida Power and Light showed that the whiter (and therefore more reflective) the roofing material, the lower a home's energy bill. White metal or cement tile roofs can reflect more than 70 percent of the sun's energy, and also have the ability to cool quickly at night. Instead of increasing the insulation of a roofing system, "white roofing" can be used to reduce cooling energy consumption by increasing the amount of heat that is reflected (instead of absorbed) by the roof of the house.

When it's time to replace your roof, consider using high-reflective roofing materials or applying a light-colored coating (such as white latex) over an existing roof.
- For more information view the Department of Energy's Building Technologies Program

Original website content and design created by Mark Hostetler, Elizabeth Swiman, and Sarah Webb Miller.

Living Green

Living Green

Heating and Cooling

Additional Resources

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