Install Windows Sun Screen From Inside

Because low-E blocks sun, it may leave some rooms cooler than you want in the winter. As a result, you should ask your window installer how low-E glass will affect the room's temperature during the winter.

For hotter climates, Mike Gilkey, owner of Gilkey Window Company in Cincinnati, suggests installing window glass with three low-emissivity coatings already built in. With LoE3, the triple stack coating goes on the exterior plate of the inside surface of the glass, so it's protected from the elements, which prevents it from tarnishing.

Expect to pay at least $300 for an energy efficient window, with costs as high as $1, 000. Angie's List members report paying $729 on average per window.

Research the energy efficient features you want in a window before hiring a window replacement professional. Those features, along with the size, style and cosmetic appeal, affect the final price of the window. Although pricey, experts say the investment in energy efficient windows will pay for itself over time.