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Heat Mirror Film Technology

Energy Efficient Heat Mirror Insulating Glass

Heat Mirror Insulation in Energy Efficient Windows

If you are looking for unprecedented comfort and energy efficiency in a window, look no further than Heat Mirror™ insulating glass.

Southwall Technologies was the world's first commercially produced low-e glass incorporating Heat Mirror films. Since 1980, Heat Mirror insulating glass has been used around the world in structures ranging from single family homes to high profile projects for Fortune 500 companies.

Heat Mirror film technology utilizes nanoscale coatings of metal which reflects heat back to its source, hence the name: Heat Mirror, a mirror to heat. Outstanding winter insulation and superior solar control provide year-round savings and enhanced comfort.

Some of the Benefits of Heat Mirror Windows & Doors

Energy Efficiency Icon

Energy Efficiency

UV Protection Icon

UV Protection

Noise Reduction Icon

Noise Reduction

Improved Comfort Icon

Improved Comfort

Curious About How Heat Mirror Technology Works?

The heat mirror glass technology is second to none when it comes to efficiency, UV protection and quality. Interested in learning more? Read the Heat Mirror Technolgy guide for more information and to learn why we choose to offer the Freedom Genesis & Freedom Accent lines to our customers.

Check out these Popular Science Magazine articles, "Wonder Windows" and "Thinking Window Can Switch Off The Sun" article here.

Energy Efficiency

Heat Mirror Increases Energy Efficiency

Twenty-five percent of heating and cooling energy escapes through the windows of your home. Heat Mirror glass is up to four times more effective than standard double pane glass in reducing heat loss, providing superior thermal performance. When the sun threatens to overheat rooms, Heat Mirror blocks twice as much heat from entering your home, reducing air conditioning expenses.

You save money and improve your comfort level all year round. In fact, windows with Heat Mirror glazing systems can return your investment by producing a reduction in annual energy expense. And by saving energy, you’ll also be saving the environment.


  • Reduce air conditioning costs
  • Lower HVAC requirements
  • Enhance thermal performance
  • Year round comfort
  • Maximize usable living space
UV Protection

UV Protection

Heat Mirror™ insulating glass blocks 99.5% of the sun's destructive ultraviolet (UV) radiation, helping reduce damage to valuable furnishings and protecting upholstery from fading and deterioration. Heat Mirror's exclusive XUV® fading protection umbrellas your furniture, drapes and carpeting, providing the ultimate in UV protection.

Laboratory studies indicate that fabrics behind clear Heat Mirror glazing resist fading and retain their original color up to three times longer than fabrics behind clear single pane glass. It can also help protect art and window dressings from become dull and faded over time like with traditional windows.


  • Superior insulating performance reduces energy costs and enhances comfort
  • Blocks 99.5% UV rays
  • Superior solar shading reduces expensive cooling costs
  • UV protection helps reduce interior fading
  • Noise reduction reduces noise pollution

Clearer Glass Without Condensation

Condensation is a warning that heat is escaping through your windows. Worse, condensation can ruin your view, stain your windows and destroy wall coverings.  Heat Mirror™ provides up to four times the insulation of dual pane windows, which helps reduce condensation.

Without Heat Mirror Windows/Glass

Condensation Control

Windows With Heat Mirror Glass

Improved Comfort from Window Insulation

Superior Window Insulation in Cold Temperatures

Heat Mirror resists wintertime condensation at exterior temperatures up to 45 degrees colder than conventional insulating glass, a particularly important benefit for pool and spa enclosures, computer rooms, and other high-humidity environments.

Benefits of Heat Mirror Insulating

Windows Insulation that Improves Comfort

Even when outside temperatures are very low, Heat Mirror™ keeps the interior glass temperature close to the room temperature, reducing drafts and chilly spots near windows.


  • Warmer inside glass temperature
  • Enhanced condensation resistance
  • Maximize usable living space
  • Enhanced thermal performance
  • Year round comfort