Your Guide to Window Savings

The windows in your home let natural light and fresh air in while keeping out extreme weather and pests. But did you know your home could be losing up to a quarter of its total heating and cooling through its windows?

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Easy no cost or low-cost window tips to save you more

Start with these simple changes and, when it’s time for a replacement, use our shopping guide to help take savings to the next level.

Made in the shade

Keep window coverings drawn on warm summer days to prevent solar heat gain and reduce the need for air conditioning.

Fill the gaps

Up to 13% of your home’s total heating and cooling could be escaping through your trim. Draft proof or weatherstrip around window frames to prevent air loss.

Let the sunshine in

On sunny winter days, open window coverings to let warm light in. Once the sun sets, close them to retain heat.

Add Window Film

Seal your windows with inexpensive plastic film using a hair dryer. Both indoor and outdoor sheeting are available, so be sure to read the label.

Invest to Improve

If your windows are more than 20 years old, are damaged from severe weather or you notice they are drafty, it may be time to consider replacements. Here are some helpful pointers when planning your upgrade.

Call a contractor

Talk to at least three qualified contractors, compare quotes and check references to find the best person for the job.


The lowdown on low-e

Ask your contractor about low-emissivity coating. This coating will keep summer heat out, while keeping the heat in during winter months.


The right questions

Ask your contractor about installation and warranty options, and what energy savings you can expect from the new windows.


Be window wise

Look for windows with this industry-backed guarantee, which protects consumers. Learn more here.


Think Beyond Windows

Sliding glass doors and skylights also have energy performance ratings. By upgrading to ENERGY STAR® certified doors and skylights, you can cut down on energy loss and reduce condensation throughout your home.


Cut down on heating and cooling costs during on-peak hours

Controlling the temperature of your home during on-peak times can make a big difference on your bill. In summer, on-peak hours are weekdays from 11 a.m. - 5 p.m. and in the winter, on-peak hours are weekdays from 7 a.m - 11 a.m. & 5 p.m. - 7 a.m.

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Window Shopping Tips

Today's ENERGY STAR® certified windows are up to 40% more efficient at retaining heat and air conditioning compared to standard windows. To help you make an informed choice about upgrades, here’s what you need to know.

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Signs it might be time to replace your windows

  • Higher than usual heating and cooling costs
  • Drafts around windows
  • Condensation or frost on windows
  • Damaged, loose or warped glazing

Look for the ENERGY STAR for the highest efficiency

ENERGY STAR® certified windows reduce an average household's energy costs by about 8%, compared to a standard window. They also help reduce condensation and outdoor noise, which can help increase your home’s resale value, help you save on heating and cooling and make your home more comfortable year-round.


The climate zone for which it is certified


Certified performance ratings


A description of coatings, glazing and materials


Certification information

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Know Your Climate Zone

Canada is divided into three climate zones, with Zone 1 being the warmest and 3 the coldest. If you live in Ontario, you fall into either Zone 2 or Zone 3. Always choose ENERGY STAR® windows that are certified for your region. And remember, you can even save more on energy costs by choosing a window designed for the coldest climate zone (Zone 3).

Ratings are everything

  • The Canadian Standards Association and various energy utilities developed window Energy Ratings (ER) to measure overall performance. A lower number is better. To earn the ENERGY STAR® label in Canada, a window must have a minimum ER of 25 in Zone 1, 29 in Zone 2 and 34 in Zone 3.
  • R-Value measures the window’s ability to retain heat. A higher number is better.
  • U-Factor measures the window’s resistance to heat loss. A lower number is better.
  • Solar Heat Gain Coefficient (0-1) measures the amount of solar radiation through a window. A lower number is better.
  • Visible Transmittance is a percentage and measures the amount of light that passes through the window. A lower number is better.

Home Insulation Savings

Seal in more energy savings with caulking, weatherstripping and insulation to better protect your home and your wallet.

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Ratings are Everything

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Visit the Energy Hub for additional information on what to look for in energy-efficient products, as well as cost-saving rebates.

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