Choosing the right Low-E (Low emissivity) window is more important today than ever before. With advances in insulation and Low-E technology it is important to know what window will function best for your home. This Low-E technology comes in a wide verity of formulas with now two alike. This doesn’t mean that some are better than others, rather it depends on the climate you live in and the orientation to which your home faces the sun. To gain the most energy efficiency each window should be taken into account its relativity to the sun. With the verity of window formulas, manufacturers are able to create the right application for you.
As mentioned earlier the type of climate you live in is a major deciding factor in selecting the right Low-E window for your home. Cooler climates, it is important keep the warmth inside while enabling long-wave solar heat gain to maintain that warmth. To achieve this transmittance of heat, a low-E hard coat is applied to the inner surface of the window. This allows more light transmittance than a soft coat encouraging passive solar heat gain warming your home with natural light.
As for warmer climates, a soft coating of low-E is recommended. This type of low-E blocks out the hot suns rays keeping the interior of the home cool.
In moderate climates such as here in New England, choosing the right low-E window can get complicated. This is when it become important to take into account each windows orientation to the sun. Relatively little direct sunlight hits northern facing windows, therefore it is not as necessary to use a soft coating of Low-E. Rather it would be more efficient to have a well insulated double or triple pain window with hard coated low-E to allow a comfortable transmittance of solar heat. It is important to consult a professional for any questions in choosing the right Low-E window for your home.
As for those windows facing south, it more efficient to allow solar heat gain during winter and lowering it during the summer months. This is what makes living in such a climate difficult in selecting the right window. The most effective type of window to keep the interior of your home comfortable would be one that is well-insulated. The effects of using a hard or soft coating is minimal in the chancing seasons. But there are ways to control the admittance of light into your home by the use of shades or curtains. In the warm months having a shade to block the heat of the suns rays will help keep your home cool, while having them open in the winter will allow your home to gain some extra heat.