Sierra Club Green Home

Studies conducted by the American Society of Heating, Refrigerating and Air-Conditioning Engineers show that windows can account for 25-30% of the total heating and cooling energy use in a home. Optimal window performance requires some research to determine the most appropriate units for a home based on energy efficiency, solar exposure, usability and aesthetics.

Those of us who live in cold climates understand that insulation plays an important role in keeping our homes warm and comfortable. However, air leakage into an attic is often much harder to diagnose and consequently overlooked as a major concern. Both R-value and air sealing are equally important in creating a solid thermal boundary between the interior of your home and harsh exterior conditions.

Leaving cracks and crevices for air to leak in and out of your home can make life feel drafty and uncomfortable. It can allow moisture-laden air to sneak inside, increasing the likelihood of condensation, mold, and rot.