Extreme manufactures Concerto High Energy-Efficient Window Systems, tested at -30°C, for comfort, security and a greener community.

The ECO Window

Featuring the industry’s largest product selection, EXTREME WINDOWS & ENTRANCE SYSTEMS MANUFACTURES Concerto premium systems have achieved the highest energy savings rating in the industry, making them ideal for use in the construction of ENERGY STAR® qualified fenestration products.

Advanced testing has also shown that Concerto systems remain as airtight at -30°C as they are at room temperature. This remarkable capability is due to the fact that we use only the highest quality raw materials and shape the components with extreme precision, constant quality and ease of assembly.

Listen to our Concerto Eco radio ad!


Windows and doors designed and handcrafted
to withstand our Atlantic Canadian climate.


The international ENERGY STAR® symbol is a simple way for consumers to identify products that are among the most energy-efficient on the market.

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Health Smart

Protect your family and your home against window condensation by choosing Health Smart Windows® made with Super Spacer® high performance glass.

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NFRC Ratings

Manufacturers must test their FENESTRATION products according to NFRC procedures, which include independent testing at NFRC approved laboratories.

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ABSDA is a not-for-profit association representing nearly 600 building supply retailers, suppliers and distributors which focuses on the needs and interests of the industry.

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Our Associated Partners in Business