The building envelope—walls, roof, windows, and doors—is central to energy efficiency. Insulation slows heat transfer, keeping your home warm in winter and cool in summer, while air sealing blocks drafts. Windows and doors can be major points of energy loss, so selecting efficient, well-sealed models is important. Proper insulation and sealing also prevent excess moisture, reducing the risk of mold and supporting healthy indoor air.
What residents can do:
- Add weatherstripping around doors and windows
- Caulk gaps in accessible areas
- Install thermal curtains or window film
Professional upgrades:
- Upgrade insulation in walls, attics, and crawlspaces
- Replace windows and doors with ENERGY STAR-rated models
- Conduct blower door testing to identify air leaks
Resources:
- Building Performance Institute
- Insulation | Department of Energy
- Home Page | RESNET
- Weatherstripping | Department of Energy
- Caulking | Department of Energy
- Applying Plastic Over Windows Project | ENERGY STAR
