Low Ē²-272 Glass
Who says you can’t do anything about the weather? Low Ē²-272 glass delivers year-round comfort in all types of weather. In summer, it rejects the sun’s heat and damaging UV rays. In winter, it reflects heat back into the room.
Regardless of where your home is located, choosing windows that provide you with the highest level of comfort and energy savings year-round is extremely important. And choosing the right glass for your windows is the most important factor in that decision. Go beyond ordinary low-e glass. Let Low Ē²-272 help you handle the weather – any weather.
When the temperature is heading to the top of the thermometer, ordinary window glass simply welcomes in the heat. Low Ē²-272, however, has been specially formulated to reject the sun’s heat and damaging rays and keep your home cool and comfortable. The patented Low Ē²-272 coating provides high performance solar control and visual clarity. The end result of all this engineering is that Low Ē²-272 provides the ultimate in comfort because it reduces window heat gain by 50% or more when compared to ordinary glass.
During cold weather, the insulating effect of your windows has a direct impact on how your rooms feel. Typically, 75% of the exposed surface of a window is glass, and the temperature of the room-side of the glass directly affects the air temperature in the room. The better insulated the window glass, the warmer your room will be.
In fact, the Efficient Windows Collaborative suggests that when glass surface temperatures fall below 52°F, there is a risk of thermal discomfort. To maintain the best comfort during the winter, select a glass product that produces surface temperatures that will stay above this point during the coldest outdoor conditions.
Low-E Glass Benefits
The superior insulating capability of LoĒ²-272 is a key factor in the construction of comfortable windows for cold climates. The dramatic comfort improvement from windows with warm glass surfaces also means the relative humidity of the indoor air can be controlled and maintained properly. Proper humidity levels (not too much, not too little) will improve comfort and promote a healthier living environment.
The table below compares the room-side center of glass temperatures of different glass types against two different winter conditions.
|Outside Temp -20° F (-30° C)||Outside Temp +20° F (-10° C)|
|Single-pane, clear||0°F (-19°C)||31°F (-3°C)|
|Double-pane, clear||37°F (2°C)||51°F (9°C)|
|Ordinary low-e (air fill)||46°F (7°C)||57°F (13°C)|
|LoĒ² – 272 (air fill)||49°F (9°C)||58°F (14°C)|
|LoĒ² – 272 (argon fill)||52°F (10°C)||60°F (15°C)|
Energy Savings of Low-E 272 Glass
Although windows provide beautiful views and wonderful natural light, they can also account for up to 50% of the heating and cooling energy consumed in a home. In the summer LoĒ²-272 keeps your home cool and comfortable by rejecting the sun’s heat and damaging rays. In the winter it helps your home stay warm and cozy by blocking heat loss to the cold weather outside. In short, it can save energy year around.
* Thermostat settings are the largest variable in establishing the heating and cooling energy savings potential with window replacements. If you tolerate the discomfort from your current windows and don’t change thermostat settings with the weather, consider the savings suggested from the “Fixed Thermostat” column. If on the other hand you frequently adjust the thermostat, add space heaters to compensate for cold rooms, or close drapes/blinds to block the sun consider the additional savings suggested in the “Equal Comfort” column.
Low E Glass Ratings
|Visible Light Trans- mittance||Solar Heat Gain Coefficient||Winter U-Factor (Air / Argon )||UV||Fading Trans- mission|
|Single-pane, clear||90%||0.86||1.04 / –||0.71||0.84|
|Double-pane, clear||82%||0.78||0.48 / –||0.58||0.75|
|Ordinary low-e||76%||0.72||0.34 / 0.30||0.50||0.68|
|LoĒ² – 272||72%||0.41||0.30 / 0.25||0.16||0.55|