ENERGY EFFICIENCY - WINDOWS
Windows make up anywhere between 10% to 30% of the exterior wall area of a typical home, providing us views, daylighting, passive solar heating, and natural ventilation. Unfortunately, they can also contribute to as much as 30% of the heat loss or heat gain. To consider whether to replace your old windows or to select the right window for your new home is not an simple task. But due to the high cost of windows (and doors), it pays to spend a little time to do some research before you decide.
If you going to install new windows or you are building a new home, here are a few websites that contain useful tips on selecting windows and ensuring the installation is done right.
Energy Star website gives you purchasing tips on buying windows.
Efficient Windows Collaborative has a fact sheet on Selecting Energy Efficient in Washington talks about the basic properties of efficient windows and its recommendation for both western and eastern Washington.
When shopping for new windows, pay attention to the National Fenestration Rating Council (NFRC) label.
This label provides a reliable way to determine the energy efficiency properties of the window. It tells you the U-factor, solar heat gain coefficient, visible transmittance, and air leakage.
If you decided not to replace your windows, there are some less costly measures to improve on efficiency. The Department of Energy, Energy Efficiency & Renewable Energy website has some useful suggestions including adding storm windows, caulking and weather stripping and adding window treatments or coverings.
