🪟 Window Insulation Cost Calculator

Estimate the cost of insulating windows for winter. Covers shrink film kits, insulation panels, thermal curtains, weatherstripping, and draft snakes.

Project Details

Number of Windows (windows)

Total number of windows you want to insulate this winter

Average Window Size (sqft)

Average square footage per window (e.g. a 3x4 ft window = 12 sqft)

Insulation Method (1=shrink film, 2=panels, 3=curtains)

1 = plastic shrink film kit (cheapest), 2 = rigid foam panels, 3 = thermal curtains (best aesthetics)

Enter your details and hit Calculate to see results.

✓ Shrink film kits are the most cost-effective option and reduce heat loss by up to 35% per window
✓ Clean window frames thoroughly before applying tape — dust and grease cause early peel-off
✓ Thermal curtains work best when they extend 4–6 inches past the window frame on all sides to trap air
✓ Rigid foam panels can be cut to fit and stored for reuse each winter, making them cost-effective over time