Windows let heat out in winter and in during summer.
Ways to help
- Seal air leaks around frames
- Close coverings at night in winter
- Open south-facing coverings on sunny winter days for free heat
- Close coverings on sunny sides in summer
- Consider storm windows or interior panels for old single-pane windows
The U.S. Department of Energy says heat gain and loss through windows accounts for about 25 to 30 percent of home heating and cooling energy use. Open Window Daily isn't paid by any window or curtain brand.