Energy-Efficient Residential Windows, Doors and Skylights

Repair, improve or replace?

If the frame and sashes of the window, door or skylight are still in good shape, you can improve their airtightness by adjusting or replacing hardware and weatherstripping and adding caulking on exterior walls around the frames. If there is fogging or condensation between the panes, you may be able to replace the panes with glass that reduces heat loss. Heat loss can also be reduced by installing a storm window (exterior or interior) or a storm door. For more information on window retrofit and repair options, see Natural Resources Canada's (NRCan's) fact sheet, Improving Window Energy Efficiency.

However, if your window, door or skylight is more than 25 years old, or if the frames, sashes and weatherstripping are deteriorating beyond repair, then it is time to start thinking about buying a new product.