In addition to the tips below, visit myEnergy Marketplace for additional information on what to look for in energy-efficient products, as well as cost-saving rebates.

Windows let in views, sunshine and pleasant breezes, 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?

Shopping tips


Try these no-cost or low-cost window tips

Start with these smart moves and, when it is time for a replacement, use our shopping guide to help take savings to the next level.
Window with blinds icon
Made in the shade

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

Caulking icon
Fill the gap

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

Sun peeking out of window icon
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.

Window film icon
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

How old are your windows? If they are more than 20 years old, damaged from severe weather or you notice they are drafty, it may be time to consider replacements. Here are some helpful pointers for planning your upgrade.
  • 1

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

  • 2

  • The lowdown on Low-E
  • Ask your contractor about low-emissivity coating. This coating will keep the heat out in summer, while keeping the heat in during winter.

  • 3

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

  • 4

  • 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.


Time-of-Use tips

Cut down on heating and cooling costs during on-peak hours with these simple tips
  • 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  7 a.m - 11 a.m. & 5 p.m. - 7 a.m..

    Winter: 7 a.m. – 11 a.m. & 5 p.m. – 7 p.m.) can make a big difference on your bill.

  • Use curtains, blinds and shades to help control the temperature of your home.

  • Do you have large windows that get a lot of direct sunlight in summer? Consider installing an adjustable awning outside. This old-fashioned idea really works to keep you house cool!

Learn more about Time-of-Use pricing

Man looking upwards

Insulation tips

Seal in further energy savings with caulking, weatherstripping and insulation.

Learn how

Shopping tips

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

Diagram to understanding the ENERGY STAR® label

1 The climate zone for which it is certified

2 Certified performance ratings

3 A description of coatings, glazing and materials

4 Certification information

Map of Ontario zones
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.

Sign up for myAccount

Get 24/7 access to your account, take advantage of paperless billing, get high usage alerts and more.

Log in or register now