The view is only half the story.

How it works

Glass coatings and glazing affect how much heat moves through a window. The U.S. Department of Energy explains that low-emissivity coatings can reduce heat transfer through glass.

The right choice depends on the climate, the direction the window faces, shade and the rest of the house.

Appearance versus performance

An old-looking frame is one question. Air leaks, afternoon sun and glass performance are others. Ask which part of a proposal addresses the problem you actually have.

Your decision

A specific complaint, such as which room is uncomfortable and when, is more useful than a general promise of efficiency. Compare repair, sealing and replacement options.