Understanding ENERGY STAR® Ratings in Windows and Doors

ENERGY STAR® is the international symbol for energy efficiency, and it’s an important standard to consider when choosing windows for a more comfortable, eco-friendly home. As the 2025 ENERGY STAR® Manufacturer of the Year, Durabuilt is committed to delivering high-performance, high-quality windows and doors that help homeowners save energy year-round.

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We make it easy to choose the right ENERGY STAR® certified windows and ensure they deliver the performance your home needs.

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In this blog we covered some tips you should consider when choosing an Energy Star rated windows and doors for your home:

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1. Find Your Climate Zone

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The ENERGY STAR® program divides the country into four climate zones based on annual average temperature. Zone 1 is the mildest and Zone 3 is the coldest.

Visit http://oee.nrcan.gc.ca/ to find your town’s specific zone.

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By installing energy efficient windows and doors in your home you can reduce energy costs by 7-12% or more*.

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* ENERGY STAR® statistic based on controlled testing.

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2. Choose Windows & Doors that Qualify for that Zone

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Once you determine your qualifying zone, you must select your windows, doors and performance options to meet that zone’s criteria. Low E with argon is a minimum requirement of the ENERGY STAR® program.

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Durabuilt windows can be configured to meet the most stringent ENERGY STAR® zones, especially our Casement Window Collections. To identify the qualifying zone of your windows:

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a) Reference our Product Performance Charts

b) Visit http://oee.nrcan.gc.ca

c) Check your Durabuilt quote / order summary

d) Ask your Durabuilt Sales Consultant for more information

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3. Retain Your Labels Upon Installation

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As part of the new ENERGY STAR® program Durabuilt has implemented a labeling system that clearly summarizes your window’s CSA and ENERGY STAR® information. This includes the zone for which the product qualifies – 1, 2, 3 – along with the relevant performance data including the U-Factor, Solar Heat Gain Coefficient and Energy Rating.

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It is important that you keep these labels for each product purchased as they can be used to qualify for government grants and incentives, as well as our warranty program.

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ENERGY STAR® Requirements for Windows

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