Best Window Insulation Kits and Door Draft Stoppers for Winter

The Short Answer

For a drafty window, the cheapest fix that works is a shrink-film insulation kit: clear plastic you tape to the inside of the frame and tighten with a hair dryer. For the gap under a door, it is a draft stopper (no tools) or a door sweep (screws, lasts for years). Here is what each pick is for:

Our pick for most homes: the Duck 10-window kit, because film is film for most windows and it costs about half as much per window as the others. Choose the 3M kit if seeing clearly through the glass matters most to you, and the Max Strength kit if a cat or a toddler will be pressing on the film. For doors, start with the Holikme adhesive strip; switch to a Frost King sweep on any exterior door that you use every day.

*Prices as listed on Amazon for delivery to Los Angeles on October 20, 2026; they change often, especially in winter. We compared each maker’s published details and the Amazon listings; we do not test products in-house (how we choose). Sources are listed at the end.

Do Window Insulation Kits Actually Work?

Yes, for comfort and drafts, with honest limits on savings. ENERGY STAR calls plastic over windows “an easy, effective, and inexpensive” option: the film reduces drafts and condensation, and when it is taped over the trim it also closes the air leaks around the sash and adds an insulating layer of still air (ENERGY STAR).

• Where it helps most: single-pane windows, old aluminum frames, and windows that rattle or whistle in the wind. On tight double-pane windows the difference is much smaller.
• What it will not do: cut your bill dramatically on its own. ENERGY STAR rates the energy impact of this project 2 out of 5 and notes that attic and basement air sealing usually matters more.
• About the “save up to 10%” claims: Duck’s footnote says that figure applies “when you properly seal and insulate your home” and is based on U.S. Department of Energy estimates, so read it as a whole-house number rather than what film alone saves (Duck).

If you are not sure which windows leak, a cheap infrared tool finds them in an evening: see our best thermal leak detectors under $50. And if you are weighing film against replacement, read do new windows lower energy bills? first.

1. Duck Brand 10-Window Kit: Lowest Cost per Window

Duck sells this as a roll rather than pre-cut sheets: 62 inches wide by 420 inches long, which Duck says covers up to ten standard 3×5 ft windows. The Amazon listing ships it as two 210-inch rolls with two 83-foot rolls of half-inch tape. You stick the tape to the frame, roll the film across, cut it to size and shrink it with a hair dryer, so there is no measuring up front.

Why it is our top pick: at about $1.50 a window it is the cheapest way to cover a whole house, and Duck lists it for painted or finished wood, aluminum and vinyl frames. The trade-off: standard-thickness film, so a pet or a curious child can poke through it.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Duck Brand Window Insulation Kit (up to 10 windows)

62″ × 420″ of shrink film plus tape; up to ten 3×5 ft windows; removes at the end of the season.

Check price on Amazon

2. 3M Indoor Window Insulator Kit: Clearest Film

3M’s five-pack fits five 3×5 ft windows using heat-shrink film and Scotch mounting tape. 3M claims its kits have “the clearest film” and says they reduce condensation and frost buildup (3M). Smaller 2- and 3-window packs are on the same Amazon listing.

Choose it if the windows face a view you care about, or you are covering just a few windows and do not need a whole roll. Skip it if you are doing the whole house: per window it costs about twice as much as the Duck roll.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

3M Indoor Window Insulator Kit (5 windows)

Heat-shrink film plus Scotch mounting tape; fits five 3×5 ft windows; 2- and 3-window sizes also listed.

Check price on Amazon

3. Duck Max Strength: For Pets, Kids and Busy Rooms

The same roll-on system as the standard Duck kit, but with film Duck describes as “puncture-resistant” and “two times thicker than standard window kits” (Duck). This pack has one 62″ × 210″ roll and 84 feet of tape, enough for up to five windows. Duck does not publish the film thickness in mils.

Choose it for a window next to a cat tree, a child’s bed or a desk where elbows and blinds rub the film. One tear lets the air layer leak, and you lose most of the benefit.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Duck Brand Max Strength Window Kit (up to 5 windows)

Thicker, puncture-resistant shrink film; one 62″ × 210″ roll plus tape; up to five windows.

Check price on Amazon

4. Frost King V76H: For Patio Doors and Picture Windows

One 84″ × 110″ sheet with double-faced tape, which the retailer listing says insulates one patio door up to 7×9 ft or a picture window. Frost King claims it can increase the R-value of single-pane doors “up to 90%” (listing).

The catch with doors: the film seals the door shut, so use it only on a sliding door you will not open until spring. For a door you still use, seal the frame and the bottom gap instead (next section).

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Frost King V76H Patio Door Kit

One 84″ × 110″ crystal-clear sheet plus double-faced tape; one patio door or picture window.

Check price on Amazon

Windows You Still Open: Rope Caulk Instead of Film

Film seals the whole window, so it is wrong for a window you open for air. For those, press removable rope caulk (also called putty cord) into the gap where the two sashes meet and along the edges. Pacific Northwest National Laboratory lists putty cord as the temporary fix for that meeting-rail gap (PNNL). It stays soft and pulls out in spring.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Frost King Mortite Caulking Cord

Removable rope caulk, 1/8″ × 90 ft; press in with your fingers, no caulk gun, pulls out in spring.

Check price on Amazon

Door Draft Stopper vs Door Sweep vs Weatherstrip

Doors leak in two places: the gap underneath and the gap around the sides and top. Pacific Northwest National Laboratory’s weatherstripping guide matches each gap to a product (PNNL):

Our full walkthrough for the door frame is in door weatherstripping: find and seal drafts.

5. Holikme Adhesive Draft Stopper: Easiest Under-Door Fix

A 41″ × 2″ strip that sticks to the bottom of the door and fills gaps up to 1 inch, according to the listing. It is the most-reviewed product in this guide (more than 49,000 ratings on Amazon) and takes a couple of minutes to fit.

Before you stick it on: clean the door bottom and check the gap with the door closed. A strip that is too stiff for the gap makes the door hard to latch. In a rental, test the adhesive on a hidden spot first.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Holikme Adhesive Door Draft Stopper

41″ × 2″ self-adhesive strip; fills gaps up to 1″; interior or exterior doors.

Check price on Amazon

6. Holikme Twin Foam Draft Stopper: For Renters

No adhesive and no screws: two foam tubes sit in a fabric sleeve that slides under the door, one on each side, and moves with it. The listing says it fits doors 1 to 1.7 inches thick and is not recommended for thresholds taller than 0.3 inches.

Choose it for a rental, an interior door to a cold room, or a door you do not want to mark. Skip it on a door with a raised threshold; use a sweep instead.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

Holikme Twin Foam Under-Door Draft Stopper

Slide-on twin foam tubes; doors 1–1.7″ thick; thresholds up to 0.3″; no adhesive.

Check price on Amazon

7. MD Building Aluminum & Vinyl Door Sweep: The Long-Term Fix

A heavy-duty aluminum strip with a flexible vinyl seal that screws to the inside face of an in-swinging door, with the screws included. It comes 36 inches long; cut the aluminum to your door’s width with a hacksaw and the vinyl with scissors. Set it so the seal just touches the threshold with the door closed. Our earlier pick, the Frost King A79WHA, is no longer sold directly by Amazon.

Choose it for the front or back door you use every day, where an adhesive strip wears out within a season. Pair it with foam tape around the frame for a full seal.

We may earn a commission if you buy through these links, at no extra cost to you. Products are chosen on published specifications; we do not test them in-house (how we choose).

MD Building Aluminum & Vinyl Door Sweep (36 in)

Aluminum with a flexible vinyl seal; screws included; cut to width; 36″.

Check price on Amazon

Frost King V443 Vinyl Foam Tape (4-pack)

Closed-cell foam tape, 3/8″ × 3/16″ × 17 ft per roll, for door and window frames.

Check price on Amazon

How to Install Window Film So It Stays Tight

1. Measure each window and buy the kit size that matches its width; kits come in several sizes.
2. Clean the frame with rubbing alcohol on a cotton ball and let it dry. Most sagging film starts with tape on a dusty or greasy frame.
3. Apply the tape around the frame or trim, press it down firmly, and leave the backing on until the film is ready.
4. Hang the film with a few inches of extra on every side, starting at the top, then press it onto the tape.
5. Shrink it with a hair dryer on high, moving from the corners toward the center, until the wrinkles disappear. Trim the excess with a sharp utility knife.

These steps follow ENERGY STAR’s guide, which also shows how to work around a mini-blind wand and advises removing the film in spring (ENERGY STAR). On old or freshly painted trim, test the tape on a hidden spot first. For more low-cost window fixes, see how to insulate windows for winter.

Frequently Asked Questions

Do window insulation kits really work?

Yes, for drafts and comfort. ENERGY STAR says shrink film reduces drafts and condensation, and when it covers the trim it closes air leaks and adds an insulating air layer. The savings are modest: ENERGY STAR rates the energy impact 2 out of 5, and the biggest gains are on single-pane or leaky windows.

Which window insulation kit is best?

For most homes, the Duck Brand 10-window roll kit, because it costs about $1.50 a window. Choose the 3M kit for the clearest film, the Duck Max Strength kit if pets or children may poke the film, and the Frost King V76H for a patio door.

Can renters use window insulation film and draft stoppers?

Usually, yes. The film and tape are meant to come off at the end of the season, and a slide-on twin foam draft stopper needs no adhesive or screws. Test any tape on a hidden spot of trim first, and check your lease before screwing a sweep to the door.

What is the difference between a door draft stopper and a door sweep?

A draft stopper sticks on or slides under the door and needs no tools. A door sweep screws to the door bottom, often adjusts to an uneven threshold and lasts much longer, which makes it the better choice for an exterior door you use every day.

Can I put window insulation film on a door?

Only on a sliding patio door you will not open until spring, because the film seals it shut. For a door you use, add a sweep or draft stopper at the bottom and foam tape or V-strip around the frame.

Related Guides

• Electric blanket vs space heater — the cheaper way to stay warm at night
• How to insulate windows for winter — every cheap window fix, compared
• Door weatherstripping — sealing the sides and top of a door
• Best thermal leak detectors — find the leaky windows first
• Most energy-efficient space heater — once the room is sealed
• Best thermal curtains for winter — for cold glass once drafts are sealed

Sources

• ENERGY STAR: Apply plastic over windows
• 3M: Indoor Window Insulator Kit, five pack (2141W-6)
• Duck Brand: Rolled Shrink Film Window Insulation Kit, 10 window
• Duck Brand: Max Strength Rolled Shrink Film Window Kit
• Frost King 84 x 110 in. patio door kit (retailer listing)
• PNNL Building America Solution Center: Add weatherstrip to windows and doors