Statewide Roofing Install Energy Efficient Windows to help save you money on your heating and cooling costs. Located in Oklahoma City proudly serve all of Oklahoma including Norman, Mustang, El Reno, Bethany and Edmond. Energy Efficient Windows with new glazing technologies not only reduce energy costs but make homes more comfortable as well. During cold weather, exterior temperatures drive interior glass surface temperatures down below the room air temperature; how low the glass temperature drops depends on the window’s insulating quality. If people are exposed to the effects of a cold surface, they can experience significant radiant heat loss to that cold surface and they feel uncomfortable, even if the room air temperature is comfortable. When the interior glass surface temperature is 52°F or less, it is most likely that there will be discomfort. During warm weather, solar radiation can cause discomfort. Just as people turn up the heat to compensate for cold windows in cold weather, they may use air-conditioning to counter the effects of warm window surfaces and sunlight in summer.