The short answer
A draft can come through worn or misaligned operable joints, failed weatherstripping, an out-of-square sash, frame joints, perimeter gaps between the window and wall, or another nearby building opening. Cold glass can also create downward room-air movement that feels drafty without outdoor air passing through the window. Locate the path and document conditions before choosing hardware repair, sealing, glass work, insert replacement, or full-frame work.
Separate air movement from cold-surface discomfort
Record the conditions
Note outdoor weather, wind direction, room temperature, coverings, and which openings feel affected.
Check operation
Open, close, lock, and inspect sash alignment, hardware, and visible weatherstripping without forcing the unit.
Trace the perimeter
Look for gaps, cracked sealant, separated trim, or movement where the frame meets the wall.
Compare product evidence
Use the exact air-leakage rating when reported, along with the window's operation and configuration.
Define the repair boundary
State whether the response addresses a component, perimeter, retained frame, complete unit, or surrounding opening.
| Compare | Observation | Question to investigate |
|---|---|---|
| Air at a sash joint | Does the unit close and lock squarely? | Are weatherstripping and hardware compatible and serviceable? |
| Air at trim or frame perimeter | Is the gap within the installation joint? | Does trim need removal to inspect insulation or sealing? |
| Cool fall of air near glass | Is outdoor air actually entering? | How do glass temperature, coverings, and room airflow affect comfort? |
Common questions
Common questions
Does a draft mean the whole window must be replaced?
Sources
Sources
- Window Types and Technologies — U.S. Department of Energy
- Window Installation — U.S. Department of Energy
- Window Energy Performance Ratings — National Fenestration Rating Council