3M vs Frost King Window Insulation Kits Compared (2026)
Two shrink-film window kits, side by side. We have not tested them.
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Both kits stretch clear film over the inside of a window and shrink it tight with a hair dryer. The difference is how many windows one box covers.
Quick picks
- Best for several windowsIndoor Window Insulator Kit, 5 Window (2141W-6)Check price
- Best for one windowV73H Indoor Shrink Window KitCheck price
Side-by-side specs
| Spec | Top pick3MIndoor Window Insulator Kit, 5 Window (2141W-6) | Frost KingV73H Indoor Shrink Window Kit |
|---|---|---|
| Best for | Several windows at once | One standard window |
| Coverage | Five 3 x 5 ft windows | One window |
| Film | 5.16 x 17.5 ft, 0.75 mil, clear | 42 x 62 in, 0.75 mil, crystal clear |
| Includes | Film, 1/2 in x 27.7 yd tape | Film, double-faced tape |
| Surfaces | See 3M instructions | Clean, dry metal, painted or varnished wood, vinyl-clad frames; not wallpaper, wallboard, plaster or veneer |
| Install | Tape, apply film, shrink with hair dryer | Tape, apply film, shrink with hair dryer |
| Price | Check price | Check price |
Specs from each manufacturer's US product page. Bars compare each spec against the best value in this table; they are not test scores. Prices change often, so we link out instead of quoting them.
The picks
★Best for several windows
3MIndoor Window Insulator Kit, 5 Window (2141W-6)
Best for: Several windows at once
A five-window kit with 0.75 mil heat-shrink film and double-sided tape, installed with a hair dryer.
What we like
- Covers five windows
- Clear film
Watch out for
- Indoor only
One 5.16 x 17.5 ft sheet and 27.7 yd of tape for five 3 x 5 ft windows.
★Best for one window
Frost KingV73H Indoor Shrink Window Kit
Best for: One standard window
A one-window kit: a 42 x 62 in sheet of 0.75 mil film plus double-faced tape.
What we like
- Single-window size
- Clear surface list
Watch out for
- One window per kit
One 42 x 62 in sheet for a single window, with a clear list of surfaces to avoid.
How to choose
- Count your windows and measure them.
- Seal drafts first. See how to weatherstrip doors and windows.
- Watch condensation. See winter indoor humidity.
Frequently asked questions
Are the films the same thickness?
Both makers list 0.75 mil film.
Can I tape onto drywall?
Frost King says no: avoid wallpaper, wallboard, plaster and veneer.
