Heat buildup in an attic (especially one that is under-insulated) can contribute greatly to a home's summer cooling load. Ventilation systems, like your temperature-controlled fan, reduce the amount of buildup, thus lowering cooling costs and improving comfort. However, because your power vent uses electricity, its energy cost will cut into your overall savings.

A more efficient way to ventilate your attic would be to install a well-designed passive system that uses no electricity at all. A good passive system could include soffit vents, installed every 8' to 12' along the roof eaves, and a continuous ridge vent. This "low-to-high" venting arrangement would allow a cooling draft to be pulled continuously through the attic.

Whatever venting method you use to control attic heat buildup, remember that the best way to limit heat transfer from the attic to your living space is to have adequate insulation in the attic. We recommend a minimum attic insulation level of R-30. R-38 is preferred.

CWLP electric customers who add insulation to your attic (or to your walls, basement, or crawl space) can qualify for our Insulation Rebate. The rebate is equal to 30% of your installation cost, up to a maximum rebate of $500. The rebate also applies to new passive ventilation systems installed in your attic, basement, or crawl space to protect the integrity of your insulation. More information about the Insulation Rebate, including a downloadable application, can be found elsewhere on this website. Or you can contact the Energy Services Office.