Have you ever paused to wonder how energy–efficient the glass windows in your home are? Is there room for improvement, or is every crack and leak sealed?

There is little doubt that energy efficient glass windows contribute significantly toward bringing down the electric utility bill. More importantly, saving energy is the strongest safeguard against environmental degradation. The less energy you use in heating or cooling your home, the less greenhouse gas that power plants have to generate—and the safer and healthier the earth becomes.

Here are a few tips that might have escaped you as you try to make your windows more energy efficient:

1. Seal any leaks.

Whenever unconditioned air leaks in or out of the house, energy is wasted. You can prevent this by caulking, weather-stripping or replacing window frames with new ones. Read more about how to seal window leaks here.

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2. Install storm windows.

There are cases in which you might not wish to replace your stylish windows but are nonetheless afraid that a lot of energy is being wasted by air leakage. In such circumstance, the best thing to do is to install storm windows. If the storm window is well installed, it will go a long way towards reducing air infiltration. Storm windows can be installed in the interior or on the exterior of your house.

3. Double glaze your windows.

Double-glazed windows consist of two layers of glass that are separated by a space, which contains air. The air between the two glasses creates extra insulation and leads to more energy efficiency.

At the end of the day, it’s the small details that really count toward making your glass windows more energy efficient.