Energy-efficient windows have:
- special coatings (known as low emissivity coatings, or “low-E glass”) and insulated frames and sashes which will reduce the cold transfer from outside and condensation on the glass.
- more glazing (panes of glass) for better exterior noise reduction and even more energy savings.
- special inert gases between the glass panes rather than just air for better insulation.
- a label on the product to indicate where the model is certified for use in Canada.
What to Look For
- A low U-value. The U-value is a measure of the window’s insulation value. Look for windows in the range of 0.25 to 1.25, with 0.25 being the best.
- Buy windows certified for installation in Canada. In Canada, all windows should be at least double-glazed – two panes of glass.
- Windows with more glazing (panes of glass) and low-E glass are the most efficient.
- Hinged windows (casements, awnings, hoppers, tilt-turns) are more air-tight than sliders.
Things to Consider
- Purchase ENERGY STAR®certified windows.
- Windows that don’t open are more energy-efficient, but floors with bedrooms require at least one window that opens for an emergency exit.
- The window frame affects a window’s insulation value, strength, maintenance and longevity. Wood and fibreglass frames are the most efficient.
- Hire trained installers to ensure your windows and skylights will perform their best.
- Window and supplier warranties vary. Compare before you purchase.
- Consider installing high insulation value windows on the east and north sides of your house to reduce heat loss.
- Have a Heritage home? Apply to the City of Toronto’s Heritage Grant Program.
- Finance your home energy improvements through the City of Toronto’s Home Energy Loan Program (HELP).
- Consider getting an EnerGuide home evaluation to help you understand how your home uses energy and identify all improvement opportunities.
- Check with your municipality, utility or retailer to see if rebates are available.
$300 to $700+ per window, plus installation.
Source: Natural Resources Canada