Windows, Insulation and Weatherstripping

About half your energy bill goes to heating and cooling your home. Proper insulation and weatherstripping will help keep the heat and cool air in, making your home more comfortable and quiet, and lowering energy costs by up to 10%.


Up to a third of the heat in your home could be going out the windows. You can prevent warm and cool air by escaping with:

  • Installing energy-efficient windows.
  • Use storm windows — you can also cover single-glazed windows with plastic sheeting.
  • Install windows with low-e coating or argon fill.
  • Use weatherstripping around windows.

Insulation and weatherstripping

The right insulation also has a big impact on your home’s energy efficiency. To improve insulation:

  • Use insulated exterior doors, not hollow ones. 
  • Caulk to seal gaps and holes between doorframes and walls, around non-opening windows, and around electrical outlets, water pipes and vents.
  • Use weatherstripping to seal door openings and windows. 
  • Insulate floors, walls, crawlspaces, basements and attics.
  • Use a dehumidifier to maintain the right humidity level.
  • Make sure your ventilation system works properly, and use a dehumidifier to keep your home’s humidity at the right level.
  • Seal and insulate your ductwork.
  • If you have a fireplace, keep the damper closed when not in use. Installing glass doors or a fireplace insert will make it more efficient by keeping keep warm air in and cold air out.