Efficiency & Performance

We offer the most advanced ENERGY STAR qualified windows and entrance systems, manufactured in the most environmentally responsible manner at our award winning Clearly Green facilities. All of our products meet the highest ISO 9001 quality standards and have surpassed industry recognized safety programs.

We are members of the Insulated Glass Manufacturers Association (IGMA), ABSDA, WRLA and Fenestration Canada. We manufacture our products to the highest industry standards that meet and exceed the requirements of the building code under several certification standards, including CSA, NFRC and ENERGY STAR.

We also meet the requirements of LEED, CaGBC and AAMA.

We have set the standard of excellence in window and door performance. There is an inherent sense of commitment to quality in all that we do, thereby guaranteeing comfort and reliability with every window and door we make.

We inspect our products throughout the manufacturing process, including a 100% final inspection before they leave our facility.

Passive House

Kohltech has windows that have achieved the rigorous certification standard of the Passive House Institute US. Below is an outline of the Passive House standard.  A Passive House is essentially a super insulated house that exceeds most existing standards relating to energy usage.

Click here to jump to our Passive House page

Glass Options

Conserving energy is important for you, and for us. That’s why we offer a wide variety of high performance glass options that will help increase your home’s energy efficiency including Low-E Argon, Energlas®, Energlas Plus®, and High Solar Gain (HSG) Glass.

For more information on our various energy efficient glass options, click here to download our detailed PDF


Keep your new windows and entrance system looking great and working great for many years. All windows and doors must be maintained properly to ensure trouble free use. All moving parts should be lubricated at least once per year and dust, dirt and lint buildup should be removed with a clean cloth. Your warranty may be void if proper product care and maintenance is not followed.

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Installation Instructions

Cross Sections

We provide an extensive list of our cross sections, which can be found in our resource section as bundles.

You can also click here to jump to our Cross Sections page


Windows and doors need to be more than just beautiful. They need to function in the harshest of climates, so that your house stays warm in the freezing cold and your house stays cool in the scalding sun. These ratings help you decide which windows and doors perform best under pressure, so that you can stay comfortable no matter what Mother Nature brings.


Not all windows and doors are made the same. When comparing products, you can ensure the product claims are accurate by confirming performance ratings and energy efficient claims at these industry websites: