from Gary in Allouez, WI:
#504
My house was built in 1939 and still has the original windows. Is it cost effective to replace them? How much savings can I expect? I know about the Energy Star rating and energy efficiency ratings, but how can I compare quality and reliability? Also, the old windows have the air pockets for the window weights, should these be insulated? If so, how?
Having a rating conducted can verify the payback.
I’ll assume you have storm windows as I attempt to answer your question regarding cost effectiveness of replacing your original windows. The difference in the U-value of new windows as compared to your existing windows (approximately .49 U-value) mostly determines the difference in the amount of heat energy loss. In most cases, payback calculations reflect a period of time longer than 20 years. One way to verify the payback would be to have a home energy evaluation conducted on your home by a consultant partnering with Home Performance with ENERGY STAR.
The rating is a computer software program that calculates potential energy savings based on particular parameters that take into account the area of each window (square feet), orientation to the sun, the shading aspects (winter and summer), your geographic location, heating (and cooling) system efficiency, and indoor temperature settings. The easiest way to get started is to call Focus on Energy at 800-762-7077 and request an information packet for the Home Performance with ENERGY STAR program be mailed to you. This packet will include a variety of fact sheets regarding energy efficiency and one that describes the Home Performance with ENERGY STAR program. You will also receive a listing of participating utilities and consultants throughout the state.
With regards to the window weight pockets… yes, they can be insulated with a variety of products that will produce a variety of results. This Web site has a short video that describes one of the most effective methods for air sealing and insulating. Alternatives to the method shown in the video involve using (minimal) expanding foam products carefully installed.
Published Thursday, October 08, 2009