Low-E Glass Energy Saving Data from Replacement Windows

Heat Reflection in Residential Windows and Doors in Dallas Tx

Low E Glass is a heat reflective glass developed in the late 70's.  It came into use as a mainstay of home improvements by the mid-80's and has readily found its way into common use in the present.  

The Texas Energy Code does mandate the use of Low-E Glass in the North Texas area, but may not apply to all remodels depending on the area. Doors are not required to have Low-E glass but it's a good idea still.

Low E glass is heat reflective and can reflect up to 80% of heat back to the source.  In the winter, Low-E Glass is designed to work in two ways: First, it transmits the sun's shortwave energy. This means it allows the sun's energy (which provides visible light and invisible heat) in through the windows, which helps heat a home in winter.
Second, once the sun's heat is inside a home, the coating works to reduce the amount of heat transferred through the glass to the colder exterior. As a result, less of this heat, as well as the heat produced by a furnace, is transmitted back through the glass to the outside, helping to reduce heating bills in winter.
In the summer, heat enters a house through ordinary clear glass to the cooler interior. This happens in two ways: first, through direct shortwave sunlight; and second, by long-wave radiation generated by sidewalks, driveways, and other elements which have absorbed heat from the sun. Low-E Glass effectively reduces this unwanted radiant heat gain by reflecting a significant portion of long-wave radiation back to the outside, helping to keep homes cooler and reduce cooling costs in summer.

Reduction of Heat Loss in Winter
Low-E Glass reduces heat loss to the cold outdoors by dramatically reducing radiant heat transfer and actually reflecting interior heat back into the room.  This means that your furnace heat is actually reflected back in towards the house as opposed to its natural tendency to move towards the cooler air outside.


A Source of Free Energy
Unlike the gray and bronze tinted glass of the past (Low-E Glass allows more of the sun's rays to enter a home as solar energy to be converted into usable heat in winter.


Reduced Heat Gain in Summer
The same effect of keeping interior heat inside in the winter helps reduce the flow of hot outside air into the cooler interior in summer.


Lower Utility Bills
The bottom line is that Low-E Glass helps reduce the number of heating and cooling Btus needed to keep a house at a comfortable temperature. That means furnace and air-conditioning systems work less, and that can add up to significant energy savings.


Reduction of UV Rays
Low-E Glass significantly reduces transmission of the sun's damaging ultraviolet rays, one of the leading causes of premature fading and degradation of fabrics, upholstery and carpeting.


Comfort
Consumers want comfort and savings. No one enjoys sitting near a cold, drafty window in winter. Low-E Glass works to raise the inside glass surface temperature in winter, to help minimize cold spots and keep homeowners more comfortable.

Minimized Condensation
Since Low-E Glass helps keep the inside glass surface temperature warmer, homeowners can enjoy a more comfortable, higher humidity level with greatly reduced condensation and fogging.


Larger Window Areas
Because Low-E Glass is an energy-efficient, high performance glass, architects, builders, and homeowners have the freedom to incorporate larger window and glass areas in their designs, without the resulting excessive energy costs.


Appearance
Todays' Low-E Glass is color-neutral. Homeowners can enjoy the great looks as well as the great performance of windows made with Low-E Glass.

Energy Savings Statistics

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