Windows and doors are essential elements of any home, providing natural light, ventilation, and security. However, they can also be significant sources of energy loss if not properly sealed and insulated. In Ontario, where varying weather conditions are common, ensuring energy efficiency in windows and doors can greatly improve your home’s comfort, monthly cost savings, and environmental sustainability. Energy Star helps Ontarians make informed decisions about their home’s energy performance. Here’s everything you need to know about Energy Star windows and doors in Ontario, Canada.

The Importance of Energy Efficiency

Windows and doors can account for a significant portion of a home’s energy loss, particularly if they are old or poorly insulated. In Ontario’s climate, with cold winters and hot and humid summers, energy-efficient windows and doors play a vital role in maintaining indoor comfort and reducing heating and cooling costs. By choosing Energy Star-certified windows and doors, homeowners can enhance thermal performance, minimize drafts, and create a more comfortable living environment year-round.

Understanding Energy Star Criteria

Energy Star-certified windows and doors undergo rigorous testing to meet specific criteria for energy efficiency. Here are some key factors to consider when evaluating Energy Star products:

  • U-Factor: This measures the rate of heat loss through a window or door. Lower U-factor values indicate better insulation and greater energy efficiency.
  • Solar Heat Gain Coefficient (SHGC): SHGC measures the amount of solar heat that enters through a window or door. In hot climates, a lower SHGC helps reduce cooling costs, while in colder climates like Ontario, a higher SHGC can assist with passive solar heating.
  • Air Leakage: Energy Star-certified windows and doors are tested for air leakage, ensuring tight seals and minimizing drafts that can contribute to energy loss.
  • Visible Transmittance (VT): VT measures the amount of visible light that passes through a window or door. Higher VT values indicate more natural light, reducing the need for artificial lighting during the day.

Benefits of Energy Star Windows and Doors

Choosing Energy Star-certified windows and doors offers numerous benefits for Ontario homeowners:

  • Improved Energy Efficiency: Energy Star products help reduce heating and cooling costs by minimizing energy loss through windows and doors.
  • Enhanced Comfort: Well-insulated windows and doors create a more comfortable indoor environment by reducing drafts and maintaining consistent temperatures throughout the home.
  • Noise Reduction: Energy Star-certified windows and doors can also help minimize outdoor noise infiltration, providing a quieter living space.
  • Environmental Sustainability: By reducing energy consumption, Energy Star products contribute to lower greenhouse gas emissions and promote environmental sustainability.

Incentives and Rebates

In Ontario, homeowners may be eligible for incentives and rebates when upgrading to Energy Star windows and doors. These incentives are typically offered through government programs, utility companies, or local municipalities and can help offset the cost of energy-efficient renovations.


Energy Star-certified windows and doors are essential components of an energy-efficient home in Ontario, Canada. By prioritizing energy efficiency and choosing Energy Star products, homeowners can enjoy lower energy bills, increased comfort, and reduced environmental impact. Whether you’re building a new home or renovating an existing one, investing in Energy Star windows and doors is a smart choice that pays dividends for years to come. With their proven performance and numerous benefits, Energy Star-certified windows and doors are a cornerstone of sustainable living in Ontario.