Checking windows for energy loss is a good place to start if a room feels drafty or takes longer to heat or cool. A close look at the frame, glass and window coverings can show which fix is worth trying first.
Inspect before buying anything
On a windy day, feel for air near the frame and where a movable sash meets the frame. Check that the window closes and locks properly. Notice whether the problem is a draft, hot afternoon sun, or condensation between panes. Each points to a different fix.
Match the repair to the problem
Use appropriate weatherstripping where a window opens and compatible caulk at stationary gaps. Keep manufacturer drainage openings clear. Shades or exterior shading can help with unwanted sun, while failed seals, water damage or persistent condensation deserve a closer look.
Compare repair with replacement
Get the installation details and ask how a proposed replacement fits your climate. The NFRC label helps you compare heat loss and solar heat gain. Price the repair and replacement separately so you can decide which solves the problem you actually have.
For more detail, see the U.S. Department of Energy’s energy-saving guidance. Also see Energy Conservation Tips for another part of this series.