Feeling outside air around a closed window can make a room uncomfortable and increase the amount of work your air conditioner or heating system has to do.
The draft may come from the window itself or from gaps around its frame.
1. Make Sure the Window Is Fully Closed
Check that the window is completely shut and properly latched.
Some windows can appear closed while still leaving a small gap.
2. Check the Weatherstripping
Inspect accessible seals and weatherstripping around the window.
Look for sections that are:
- Missing
- Cracked
- Flattened
- Loose
- Brittle
Damaged seals may allow outdoor air to enter.
3. Check Around the Frame
A draft may originate between the window frame and the surrounding wall rather than through the movable window itself.
Look for visible gaps, deteriorated caulk, or cracks around the perimeter.
4. Check for Damage
Warped frames, damaged window components, or windows that no longer close squarely may prevent a proper seal.
5. Consider the Age of the Window
Older windows may become less effective at preventing air leakage as seals and components deteriorate.
That does not automatically mean the entire window needs replacing, but its condition should be assessed.
When Should You Call a Professional?
Consider professional help if:
- The window cannot close properly
- There are significant gaps around the frame
- Water also enters around the window
- The frame is rotten or damaged
- Several windows have serious air leakage
- Basic weatherstripping or sealing does not solve the problem
Stopping unwanted air leakage can improve comfort and reduce unnecessary heating or cooling loss.