How Window Treatments Affect HVAC Efficiency

How Window Treatments Affect HVAC Efficiency One of the larger gaps in an effective home energy efficiency strategy are windows. In summer, solar energy in the form of sunlight streams through glass and heats the indoors, causing your air conditioner to run longer cycles and cooling costs to rise. In winter, furnace heat is readily lost through glass to the colder outdoors and your heating bills increase. Unstable temperature control and fluctuating comfort are additional side effects of heat gain and loss through windows.

Window treatment options can help reduce two-way heat transfer through glass. By increasing energy efficiency, costs decline and indoor comfort benefits.

Window Coverings

Blinds are available as horizontal slats or the vertical format. Closed blinds block a substantial percentage of sunlight and cut heat gain in summer. Because of the openings between slats, however, blinds are not as effective to reduce heat loss in winter.

Curtains and drapes vary in effectiveness to reduce heat transfer. The color and type of fabric used is a major factor. Medium-colored drapes with plastic backing in a neutral color can reduce summer heat gain in a room by fully one-third. During cold weather, closing drapes in a room overnight can prevent about 10% of heat loss through the window.

Window Films

Transparent polyester film that adheres to windows can add an insulating factor to glass without having to close shades or blinds. The newest varieties of window film can block more than 50% of incoming solar heat gain while still admitting over 80% of visible light. Window films also reduce heat loss during winter, keeping living spaces warmer in cold weather.

The primary ratings for window films are Solar Heat Gain Coefficient (SHGC) and Visible Transmittance (VT). Both are expressed as decimal figures between zero and one. The lower the SHGC rating, the less solar heat the film allows to pass through the window. A higher VT percentage means more visible light is transmitted.

Ask Paitson Bros. for more about window treatments that boost energy efficiency without upgrading the HVAC system. We’ve been your source for effective heating and cooling alternatives since 1922.

Our goal is to help educate our customers in Terre Haute, Indiana about energy and home comfort issues (specific to HVAC systems). For more information about other HVAC topics, download our free Home Comfort Guide or call us at 812-645-6859.

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    By Jeff Paitson
  • About Jeff

    Jeff Paitson Jeff Paitson is a third generation business owner who continues to run the business with the same values that have been passed down from previous generations since 1922.

    Jeff’s belief is that the business belongs to Jesus Christ; therefore 10 percent of the company’s profits go toward the Maryland Community Church.

    Jeff is a Terre Haute Chamber of Commerce member and in his spare time, he enjoys photography.
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  • About Ethan


    Ethan Ethan Rayburn is a lifelong resident of Terre Haute and a 2005 graduate of Purdue University.

    An Eagle Scout, Ethan spent four years as a non-profit executive with the Boy Scouts of America before joining Paitson Bros. as a comfort advisor and later General Manager. In that role, Ethan has brought a renewed enthusiasm for customer care, integrity, value, and service to Paitson Bros. Heating & Air Conditioning.

    Ethan enjoys singing and was a member of the Purdue Varsity Glee Club. He also enjoys playing and coaching soccer, spending time with his family and two young boys, and volunteering his time and resources with his church, Terre Haute First Baptist Church, which he has attended from a very young age.
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