Why Calgary Windows Frost and How to Reduce It

Reviewed October 2026. Frost and condensation can result from cold glass, indoor humidity, limited air movement, air leakage or a failed insulated-glass seal.

What to check

Use a hygrometer, improve ventilation, keep warm air moving near windows and avoid blocking registers or the window area with curtains. Wipe water promptly to reduce damage.

Between the panes

Condensation or frost between insulated glass panes may indicate a failed seal. A window professional can assess whether the glass unit or window should be repaired.

Do not rely on one humidity number for every home. The correct level depends on the building, windows, ventilation and outdoor conditions.