Do Replacement Windows Really Save Energy?

Yes — energy-efficient replacement windows can make a real difference. Here's how they work and what to look for when shopping.

How Windows Lose Energy

Old, single-pane or poorly sealed windows let heat escape in winter and enter in summer, forcing your HVAC to work harder.

Low-E Glass & Argon

Low-E coatings reflect heat while letting light in, and argon gas between panes improves insulation.

The ENERGY STAR Difference

ENERGY STAR-certified windows meet strict performance standards and can cut energy use.

Frame Materials

Vinyl is affordable and low-maintenance; fiberglass is strong and efficient; wood offers classic beauty.

Expected Savings

In many homes, upgrading to energy-efficient windows can reduce heating and cooling costs by up to 25%.