The short answer
One to three ordinary windows whose cut size fits a 42 × 62 in. sheet: Frost King V73/3H, the kit whose instructions and surface guidance we could read in full. Up to five ordinary windows: the 3M five-window kit, sized by window count, with the caveat that we could not confirm its film dimensions. Many windows, or odd sizes: Duck 288070, two long rolls you cut yourself. We have not installed any of them; this is a research comparison.
Who this is for, and who should stop here
Indoor shrink film suits single-pane or leaky older windows that stay shut all winter, in rooms with a painted, vinyl or metal frame the tape can grip. If you have not yet checked permission, frame finish, moisture and access, read the fit guide first; it also explains that film saves the fuel that heats the room, which for a gas-heated house is not the electric bill. If your windows are modern double-glazed units in good condition, film will do little and you can save the money.
How we compared them
We matched each US Amazon listing to the manufacturer's own product record by model number and, where published, UPC. We then read whatever official installation document exists for that product. Where the manufacturer's sheet for the exact pack was not available, the table says so instead of borrowing another variant's figures. We have not bought, installed, removed or measured any of these kits, and no accuracy or savings figures appear anywhere on this page because we have none.
The comparison
| Detail | Frost King V73/3H three-window kit | 3M five-window kit | Duck MAX Strength 288070 |
|---|---|---|---|
| Pack | Three 42 × 62 in. sheets with tape | Film and tape for five windows | Two 62 × 210 in. film rolls, two 0.5 in. × 54 ft tape rolls |
| Format | Three pre-cut sheets | Not yet verified | Two rolls, cut to size |
| Film pieces | 3 × (42 in. × 62 in.) | Not yet verified | 2 × (62 in. × 210 in.) |
| Uncut film area | About 54.3 sq ft uncut | Not yet verified | About 180.8 sq ft uncut |
| Tape supplied | Included; length not stated in the sources we checked | Not yet verified | 2 × (0.5 in. × 54 ft) double-sided |
| Rated for | 3 windows, one per 42 × 62 in. sheet | 5 windows up to 3 ft × 5 ft | Up to 10 windows of 3 ft × 5 ft, depending on cutting |
| Frame surfaces (manufacturer) | Clean, dry, grease-free metal, painted wood or vinyl; not wallpaper, wallboard, plaster or veneer | Not yet verified | Clean, dry painted or finished wood, aluminum or vinyl |
| Instructions we could read | Manufacturer instruction sheet (read) | Inside the package; not reproduced here | Manufacturer's rolled-kit procedure (family guidance) |
| Amazon | Check availability on Amazon | Check availability on Amazon | Check availability on Amazon |
3M's product record confirms the five-window rating and 3 × 5 ft window size, and the Amazon listing matches it. But the instruction PDF linked from the listing is for a different 3M kit (a single 62 × 84 in. pack), so we could not confirm this pack's film dimensions or tape length from a document. Rather than guess, we show "not yet verified" and recommend it by its rated window count only.
Usable coverage, worked out
Uncut film area overstates what you can cover, because each window needs a margin and each cut leaves offcuts you cannot join. Take an example window of 36 × 60 in. that needs a 38 × 62 in. piece with a one-inch margin all round:
| Kit | Film supplied | Uncut sq ft | 38 × 62 pieces | Note |
|---|---|---|---|---|
| Frost King V73/3H | 3 sheets of 42 × 62 in. | 54.3 | 3 | One window per sheet, with 4 in. spare across and 0 in. spare in length. A cut that exceeds 42 in. across or 62 in. tall in the sheet's orientation does not fit. |
| 3M 2141W-6 | Not confirmed from a document | — | 5 (rated) | Rated by the manufacturer for five windows up to 3 × 5 ft; we take that at face value and no further. |
| Duck 288070 | 2 rolls of 62 × 210 in. | 180.8 | 10 | Cutting each piece sideways, with its 62 in. side across the roll, gives 1 across and 5 along each 210 in. roll, 5 per roll; the two rolls are cut separately, not as one continuous sheet. |
Two things fall out of that table. Duck's "up to ten windows" is reachable with windows of the example size (10 pieces), and only by laying the cuts out carefully; a different window size changes the count, and no piece can exceed 62 in. in its shorter dimension because that is the roll width. Frost King's three sheets are exactly three windows only if each cut fits a sheet; the example fits, but a tall old sash window that needs 40 × 66 in. does not. Measure first, then buy.
Apply your kit's own margin instruction, not our one-inch example; manufacturers differ, and the trim location matters for where the tape sits.
Which kit for which house
Frost King V73/3H indoor shrink window kit
Three 42 × 62 in. sheets with tapeOur pick for one to three windows whose cut size fits a sheet, mainly because it is the kit we could research most completely: manufacturer instruction sheet read, surface exclusions explicit, model and UPC matched to the US listing. If your frames are painted wood, vinyl or metal and the patch test passes, this is the low-risk choice.
You have one to three windows whose cut size, including your kit's margin, fits within a 42 × 62 in. sheet, and a painted wood, metal or vinyl frame.
Windows whose cut size exceeds 42 in. across or 62 in. tall in the sheet's orientation, or frames finished in wallpaper, wallboard, plaster or veneer.
3M Indoor Window Insulator Kit 2141W-6
Film and tape for five windowsThe obvious choice for four or five ordinary windows, and the best-known brand in this category. We recommend it on its rated coverage and the matched listing, not on film dimensions we could not confirm. Follow the instruction sheet in the box; we have not read it and will not paraphrase one from a different 3M kit.
You have up to five ordinary-sized windows and want a well-known kit sized by window count.
Large or unusual openings until you have checked the film dimensions on the package.
- Exact film sheet dimensions and tape length for this five-window pack were not confirmed from a manufacturer document.
- The instruction sheet for this exact model was not located, so installation steps here are generic and you should follow the sheet in the box.
Duck Brand MAX Strength Window Insulation Kit 288070
Two 62 × 210 in. film rolls, two 0.5 in. × 54 ft tape rollsFor a whole floor of windows, or windows of awkward sizes, cutting from a roll beats juggling pre-cut sheets. The listed pack contents are verified and the manufacturer's rolled-kit procedure is public. The trade-off is that you do the measuring, layout and cutting, and no piece can exceed 62 in. in its shorter dimension.
You have many windows, or windows of mixed sizes, and would rather cut film from a roll than fit pre-sized sheets.
One or two windows; most of the roll would be left over.
- No model-specific boxed instruction sheet was found; the installation guidance is the manufacturer's rolled-kit family procedure.
Alternatives, including buying nothing
- Lock the sashes and find the actual draft first. The fit guide covers the free checks. A draft from under the sill or around the trim is not fixed by film over the glass.
- Rope caulk for sash gaps on a window you want to keep operable. Cheaper, removable, and it addresses air leaks rather than the glass.
- Heavier curtains, closed at night. Not a substitute for sealing a leak, but they reduce heat loss through the glass and you may already own them.
- Talk to the utility. Some run weatherization programs that supply and even install kits at no cost to eligible households.
And if you are here because the electric bill jumped, make sure the jump is a usage change and not a rate change before you seal anything; the high-bill diagnostic takes a few minutes and costs nothing.
Sources and evidence
What we are relying on
- 3M's 2141W-6 kit is specified for five windows of up to 3 ft × 5 ft.
- Verified from the manufacturer or official document. Exact packaged installation instructions were not located; model-specific steps are withheld.
- Duck model 288070 contains two 62 in. × 210 in. film rolls and two 0.5 in. × 54 ft tape rolls, marketed as up to ten 3 ft × 5 ft windows. Each roll is cut separately.
- Verified from the current listing and manufacturer record; not a laboratory result.
- Duck's rolled-kit guidance names clean, dry painted or finished wood, aluminum or vinyl as suitable frame surfaces.
- Verified from the manufacturer or official document.
- Frost King V73/3H contains three 42 in. × 62 in. sheets; the manufacturer table and the US Amazon listing match on model and UPC 077578018195.
- Verified from the current listing and manufacturer record; not a laboratory result.
- Frost King's instruction sheet calls for clean, dry, grease-free metal, painted wood or vinyl, and excludes wallpaper, wallboard, plaster and veneer.
- Verified from the manufacturer or official document.
What this page does not establish
- No kit on this page has been installed, removed or measured by us; the comparison is from manufacturer documents and matched listings.
- Coverage figures are editorial arithmetic from listed dimensions with an example one-inch margin; they are not manufacturer installation advice.
- 3M's film dimensions and tape quantity for the five-window pack are not confirmed and are shown as not yet verified.
- No price, availability or energy-saving figure is given.
Sources
- 3M Indoor Window Insulator Kit 2141W-6 product record, 3M. Manufacturer document; read 2026-09-07. Five 3 ft × 5 ft windows. The exact packaged instruction sheet was not located, so model-specific installation steps are not quoted.
- Duck MAX Strength Window Insulation Kit, model 288070 (Amazon listing), Amazon.com. Retail listing; read 2026-09-07. Pack contents read from the listing title and bullets.
- How to install rolled window kits, Duck Brand. Manufacturer document; read 2026-09-07. Family procedure for rolled kits; not a model 288070 boxed sheet.
- Indoor shrink window kits product table, Frost King. Manufacturer document; read 2026-09-07.
- Indoor shrink window kit instruction sheet, Frost King. Manufacturer document; read 2026-09-07.
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