What Is ENERGY STAR Most Efficient and Why It Matters for Canadian Homeowners

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When shopping for new windows and doors, many homeowners recognize the ENERGY STAR symbol, but fewer know about ENERGY STAR Most Efficient. This designation highlights products that represent the highest level of energy performance available in Canada.

For homeowners, it is one of the easiest ways to identify premium windows and doors that can help reduce heat loss, improve comfort, and lower monthly energy bills.

What Is ENERGY STAR Most Efficient?

ENERGY STAR Most Efficient is awarded to products that meet stricter performance levels than standard ENERGY STAR certification. It recognizes top-performing products in categories such as windows, sliding patio doors, and hinged doors.

For fenestration products in Canada, qualifying products must meet one of the following performance thresholds:

• U-factor of 1.05 W/m²K or lower, or
• Energy Rating (ER) of 40 or higher

These ratings are based on verified testing and help homeowners compare efficiency performance.

What Do These Numbers Mean?

U-factor measures how much heat passes through a window or door. Lower numbers are better because they indicate less heat loss.

Energy Rating (ER) measures the overall energy benefit of a product by balancing heat loss with solar heat gain and air leakage. Higher numbers are better.

Why It Matters in Canada

Canadian winters demand products that can handle cold temperatures and keep homes comfortable. ENERGY STAR Most Efficient products can help:

• Reduce drafts and cold spots near windows
• Lower heating and cooling costs
• Improve indoor comfort year-round
• Reduce condensation risk when paired with proper humidity control
• Support long-term home value

Why Durabuilt Promotes High Efficiency

At Durabuilt, we manufacture windows and doors locally in Edmonton and understand the demands of Canadian climates. Our focus is building products that meet strict performance standards while delivering long-term durability and style.

When homeowners choose high-efficiency certified products, they are investing in comfort, savings, and peace of mind.

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