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Home > Upgrades > Windows

Image of the BetterHomesTO windows upgrade card.Heat gained or lost through inefficient windows can increase the energy used to heat and cool your home by 25 to 30 per cent.

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.

Cost

$300 to $700+ per window, plus installation.

Source: Natural Resources Canada

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