Energy Efficiency

One of the most important features of a thermal window is its glazing system, a major component of the unit’s overall thermal energy efficiency. Products with "clear" glass are the least efficient, while those with Low-E are much more thermally effective. The better performing windows are those using Low-E glass with Argon or Krypton gas. With this glazing, all Harvey vinyl windows are ENERGY STAR qualified. Harvey Building Products has several different energy efficiency options that will help keep you comfortable and your energy costs down.

Energy Efficient Glazing Featuring PPG Intercept®

Harvey windows and patio doors feature the PPG Intercept® "Warm-Edge" spacer system. Intercept® is a unique, seamless coated steel U-channel system developed by PPG Industries which is located at the point of contact where the glass is sealed to the window frame. The U-channel spacer bar is manufactured as one continuous piece, providing excellent structural integrity and superior thermal performance. PPG Intercept® "Warm-Edge" technology also provides 10% warmer indoor glass edge temperatures and outstanding argon gas retention, a higher R-value, and excellent condensation resistance.


Low-emittance (Low-E) is a coating that increases a window or door's ability to diminish heat transfer, thus saving heating and cooling costs. In addition to energy savings, Low-E also effectively reduces the amount of transmitted ultraviolet light which can damage carpets, fabrics, and drapes. Harvey uses Solarban® 60 Low-E Glass from PPG Industries which is ideal for any climate throughout the U.S.

Low-E/Argon Gas

We combine PPG Intercept®, Low-E Glass and Argon gas between the glass for superior thermal efficiency. Argon gas is much heavier than air, making it more difficult for warm or cold air to pass through. This glazing choice will meet or exceed most local building code requirements and provides ENERGY STAR® qualified performance.

Insulation Diagram

Optional ENERGY STAR qualified Low-E/Argon gas-filled glazing

Double Low-E/Argon

This top of the line glazing system utilizes Low-E coating on both pieces of glass for increased UV protection and more heat transfer resistance. Argon gas between the glass makes warm or cold air pass through more difficult, thus saving energy.

Most Efficient: Harvey High Performance Glazing

High Performance glazing is available on our premium Tribute windows as well as select accessory windows. It incorporates triple glazing and Krypton gas for maximum energy efficiency when your project demands an R-5 window. Harvey’s High Performance glazing exceeds ENERGY STAR requirements.

More information about ENERGY STAR and Harvey's qualified products »

Thermal Deflection Phenomenon

Thermal deflection is a rare, natural phenomenon that can occur when sunlight reflects off of a surface with enough heat to distort siding or other materials. The damage can be to one's own residence, or to a nearby home. Click here to visit our Q&A page regarding thermal deflection.

Porch Enclosure