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3M Indoor Window Insulation, Insulator Kit for 5 Windows 3ft x 5ft, Keeps Cold Air Out and Warm Air In, Includes Heat Shrink Window Film and Scotch Window Film Mounting Tape (2141W-6)

3.7 3.7 out of 5 stars 17,407 ratings

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5-Windows
Indoor
Insulator Kit

Purchase options and add-ons

Material Plastic
Brand 3M
Item Thickness 0.75 Millimeters

About this item

  • Saves energy and reduces heating costs
  • Reduces condensation and prevents frost buildup
  • Quick and easy installation
  • Fits five 3'x 5' indoor windows
  • 1 year Limited Warranty: This 3M product will be free from defects in material and manufacture. If this product is defective, your exclusive remedy shall be, at 3M's option, replacement of the product or refund of the purchase price.Limitation of Liability: 3M will not be liable for any loss or damage arising from this product, whether direct, indirect, special, incidental or consequential
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Customer ratings by feature

Energy efficiency
3.1 3.1
Drying power
2.7 2.7
Adhesion
2.0 2.0
Easy to install
1.6 1.6

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Product Description

Product Description

Available in a variety of indoor and outdoor window sizes. 3M Window Insulator Kits keep cold drafts out and warm air in through heat shrink window film and Scotch Window Film Mounting Tape. 3M window kits have the clearest film and stay up all season long with Scotch tape technology. Scotch double sided tape holds firmly between films and surfaces.

Amazon.com

With the 3M indoor window insulator kit, you can lower your heating bills during the winter and make your home more energy-efficient. Part of 3M's line of energy-saving products, this kit includes window insulation film and a roll of double-sided mounting tape to create an airtight seal. Stretching the film removes wrinkles for a transparent view. This version of the 3M indoor window insulator kit enables you to insulate five 3-foot-by-5-foot windows.

Keep the Heat In and the Cold Out
Made by 3M, this indoor window insulator kit contains window insulation film along with Scotch Window Film Tape to keep cold drafts out and warm air in. As a result, you can reduce your heating costs during the winter. The film shrinks tight around your window for a transparent, wrinkle-free fit and is made to reduce condensation and prevent frost build-up.

Double-Sided Mounting Tape for a Secure Seal
Included with this kit is a 1/2-inch-by-27-7/10-yard roll of 3M window film mounting tape to keep your insulation in place all season long. This double-sided tape seals off cracks and crevices, creates an airtight seal, and establishes a strong bond between the surface, the tape, and the insulation film, as recommended in ENERGY STAR's "Seal and Insulate" guidelines. Featuring a convenient, ready-to-peel liner, the tape adheres easily to a variety of surfaces and stays intact upon removal.

Simple, Fast Installation
Installing the window insulation is easy. You simply unfold the film and cut it to the width of the window, allowing an extra inch on all sides. Next, you firmly apply the mounting tape around the window frame and remove the paper liner. Then you apply the film to the tape, starting at the top of the window, and reposition and stretch the film to remove wrinkles. Finally, you use a blow dryer to remove any remaining wrinkles, then trim any excess film.

Made in the United States, and designed for indoor use only, this insulator kit can be used with aluminum, vinyl-clad, or painted or varnished wood molding, but it should not be applied to veneer paneling or Lauan mahogany molding. The film and tape should be removed from the window at the end of the season. The film measures 10 square yards, or 5.16 feet by 17.5 feet by 0.75 thousandths of an inch (H x W x D), and weighs 0.33 pounds.

What's in the Box
Window insulation film and one roll of mounting tape.



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Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
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3M Indoor Window Insulation, Insulator Kit for 5 Windows 3ft x 5ft, Keeps Cold Air Out and Warm Air In, Includes Heat Shrink Window Film and Scotch Window Film Mounting Tape (2141W-6)


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From the manufacturer

3M Indoor Window Insulator Kit
3M Window Insulator Kit Tools Needed for Interior Installation
3M Indoor Window Installation Instructions
Indoor Kit 5 Windows Indoor Kit Covers 2 Windows Indoor Kit Covers XL Window Indoor Kit Covers Patio Door Outdoor Kit Covers 2 Windows Outdoor Kit Patio Door
Indoor Kit Covers 5 - 3' x 5' Windows Indoor Kit Covers 2 - 3' x 5' Windows Indoor Kit Covers One XL 6'8" x 19.5' Window Indoor Kit Covers 6’8” x 9’ Patio Door Outdoor Kit Covers 2 - 3' x 5' Windows Outdoor Kit Covers 6’8” x 9’ Patio Door
Customer Reviews
3.7 out of 5 stars
17,407
3.7 out of 5 stars
17,407
3.7 out of 5 stars
17,407
3.7 out of 5 stars
17,407
4.1 out of 5 stars
3,446
4.1 out of 5 stars
3,446

Product guides and documents

Customer reviews

3.7 out of 5 stars
3.7 out of 5
17,407 global ratings

Customers say

Customers like the ease of installation of the insulation. They mention that it's very easy to attach at the window top. That said, some complain about the ease with which it'll peel off. Opinions are mixed on quality, value, adhesion, thickness, and performance.

AI-generated from the text of customer reviews

983 customers mention707 positive276 negative

Customers find the installation of the insulation to be easy. They mention that the tape and film are easy to attach, and the instructions state that it's easiest to attach at the window top.

"...-once you get the hang of it, its easy to install-really has saved us money on home heating oilCONS:-..." Read more

"...good of a job applying the plastic on the first window, it's easy to get the hang of after a couple tries...." Read more

"...reviews, was sure the plastic would be clingy and very hard to get open and install. Not true at all!..." Read more

"...With its high-quality clear window film, simple installation process, and noticeable benefits, this insulation kit provides everything you need to..." Read more

1,512 customers mention948 positive564 negative

Customers are mixed about the performance of the insulation. Some mention that it works great on both sides, while others say that it renders it useless and a waste of time and money.

"...-quality clear window film, simple installation process, and noticeable benefits, this insulation kit provides everything you need to improve the..." Read more

"...sided tape, half of the paper backing remained on the tape making it unusable. I opened the second kit and had the same problem...." Read more

"...The tape that comes packaged is double sided and works very well on both sides...." Read more

"...In other words, the wind blows against the sheet and it doesn't fail. In North Dakota, I used these annually inside the windows...." Read more

1,347 customers mention657 positive690 negative

Customers are mixed about the quality of the insulation. Some mention that it does its job well, keeping the heat in and the cold out. However, others say that it tore, had a manufacturing or handling defect, and was flimsy.

"...The amount of cold air it has stopped is simply amazing! It's warm and cozy...." Read more

"...when the wrinkles or creases would show up, it was because the product came unstuck. I read every bit of the information...." Read more

"...I find it also keeps my house cooler in the summer. Combined with thermal drapes, you have a combination for energy savings.PROS:-..." Read more

"...uneven manner, and eventually the tape will come off and the cold air can seep in again...." Read more

401 customers mention162 positive239 negative

Customers are mixed about the adhesion of the insulation. Some mention that it sticks great and lasts for a long time, while others say that it sometimes seems to lose its adhesiveness on rough or old surfaces.

"...at removing the paint from my window frame...while simultaneously losing adhesion and falling right off of it...." Read more

"...Plastic sticks well and doesn't come undone. The amount of cold air it has stopped is simply amazing! It's warm and cozy...." Read more

"...work but unfortunately right after I stuck the tape down it all started falling off which was super frustrating...." Read more

"...PROS:- sticks great and lasts for a long time-once you get the hang of it, its easy to install..." Read more

303 customers mention101 positive202 negative

Customers are mixed about the value of the insulation. Some mention that it's saving them some money, while others say that it didn't work. The plastic is very thin and cheap, and it'll waste your money.

"...Overall a bit too costly for some thin plastic and double-sided tape, but there aren't a lot of competitive options...." Read more

"...-really has saved us money on home heating oilCONS:-..." Read more

"I gave only 3 stars because getting too expensive...." Read more

"...The film appeared really thin and cheap. Please don't let this fool you. It works great. I guess I don't know what I was expecting...." Read more

252 customers mention111 positive141 negative

Customers are mixed about the thickness of the insulation. Some mention that the plastic is fine, while others say that it's very thin and is of a lower quality than other brands.

"...Measure, cut and unfold. Make sure you've unfolded it ALL the way, it's pretty thin, some times it tricks you... Stick film onto double sided tape,..." Read more

"...The plastic is very forgiving so if there are a few wrinkles the blow dryer eliminates them...." Read more

"...It was basically paper and nothing sticky. The tape was very difficult to get started which was the first sign something wasn't right...." Read more

"...The plastic film is fine, but the tape was faulty - the backing that covers the second adhesive side didn't separate properly, rendering both rolls..." Read more

1,573 customers mention158 positive1,415 negative

Customers are disappointed with the tape. They say it's faulty, frustrating, and doesn't hold up. Customers also mention that the plastic will pull on the tape in an uneven manner, and eventually loses its adhesiveness.

"...This plastic opened easily, and was easy to stretch. The tape looked very flimsy and I did not expect it to hold, but it did and if you put the..." Read more

"...to be redone over and over again, so obviously they were losing their adhesiveness...." Read more

"...window frame is a little contoured, that means that the plastic will pull on the tape in an uneven manner, and eventually the tape will come off and..." Read more

"...The plastic film is fine, but the tape was faulty - the backing that covers the second adhesive side didn't separate properly, rendering both rolls..." Read more

1,074 customers mention81 positive993 negative

Customers have negative opinions about the ease of removal of the insulation. They mention that the paper refuses to peel off from the tape, and it's nearly impossible to peel it without it ripping the paper. Some say that the tape does not hold up and detaches from the wall within a week. Overall, customers are not happy with the ease and quality of the product.

"...-it is awfully hard to get the double stick tape off if you leave the product up for a long time..." Read more

"...the shrinkage that happened when I blow-dried it made one corner pull away from the tape...." Read more

"...because it must have dried out in a hot storage place and would not peel correctly. It seems to stick much better on tile than it does sheetrock...." Read more

"...At the top of the window, however, the tape took off so much paint in a few spots that it exposed the bare wood of the window frame...." Read more

Generously sized and sturdy plastic
5 Stars
Generously sized and sturdy plastic
I am really pleased with this plastic. It has cut down on the drafts in my room, but I don't notice much improvement in the way of blocking the cold. I don't think there has been much of an increase in the "R Factor".I did put this up by myself. I am short, and had no problems doing it.I have a 23 year old Andersen sliding door. I would love to replace it, but have to take the cheap route. When looking for the source of drafts, I used a lit match, and the wind coming through the cracks would blow the match out.The first thing I did was to use some removable rope-type caulk to seal the huge air leaks. I didn't want this plastic to be billowing.I wiped all the painted trim with a paper towel saturated with rubbing alcohol. This was recommended to prep the surface for the tape.Because my sliding patio door didn't have any base trim to attach the tape to, I had to get creative. I purchased a piece of white PVC trim (1 1/2" x 1/2") and cut it just a smidge larger than I needed. This held it in place by tension. I have carpeting in the room, so I couldn't attach trim to the floor. This trim was even with the rest of the wood trim around the door. This allowed me to run tape on all four sides.The door itself is recessed about 1 1/2" from the other trim. Although the 6 ft. trim piece fits with tension, I cut another piece of the trim to back it up and fill the gap. I used sticky back velcro to hold it in place. I am hoping to upload a photo to show how I handled this, as it is hard to describe.I should mention that I removed the door handle. The inside handle is connected with screws to the exterior handle. I thought the exterior portion of the handle would fall off, but it didn't. I reinserted the screws into the holes to make sure that the other half of the handle stays put.I put all the tape on the face of the painted wood trim (and the PVC trim piece by the floor) and pushed it on really well, rubbing my thumb over and over it. Then I let it rest for a few minutes to make sure it had set. I removed the protective paper from the top strip of tape only, and attached the plastic. I then did the same at the bottom. Finally one side, then the other. Removing the protective paper as I went along.I put a lineup of dining chairs all along so that I could just walk sideways and easily reach the top without having to re-position a step stool. Kinda like scaffolding. A short person has to be creative.I used a hairdryer according to directions. There are videos online to help you understand that part. I worked from the edges to the middle.I had enough plastic left over to do another narrow window. I also purchased the XL size kit and did a couple windows that were each over 9 ft wide. And I did them by myself. It would be easier with a helper, but I'm just sayin', that if little old me can do it alone, and not get it all twisted up, so can you.I will say that I wish I hadn't stretched the film taught to begin with, since the heat shrinking did cause that bottom trim piece to pull out of position a bit. I don't think you're supposed to pull it taught when taping. Learning curve.It sealed up tight as a drum, and crystal clear. It is a great solution for those who can't afford window replacement.UPDATE: December 2019. I continue to use this product. One “Patio Door Kit” covers my slider plus an additional 24” wide window. I also buy the same brand in the XL size, which allows me o cover the two 9 Ft. Wide windows as seen in the photos. Every winter, on a windy day, these will billow out like spinnakers, but stay in place. I have had some minor spots on the wood trim where paint pulled off, but it’s a fair trade for tape that holds under stress.I did end up putting a couple (well, 3) screws into that trim piece at the slider threshold. Yup, just drilled right through the carpeting. That trim piece gives me a point of attachment for the slider, so it is worth it.Yes, it is a pain to evenly distribute and shrink wrap this stuff, but it is worth it. I should also mention that to smooth out the creases, hold the hair dryer close and when the film is hot, rub it with your hand.
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Top reviews from the United States

Reviewed in the United States on November 15, 2023
Size: 5-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
9 people found this helpful
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Reviewed in the United States on October 25, 2013
Size: 5-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
33 people found this helpful
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Reviewed in the United States on January 10, 2016
Size: 5-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
26 people found this helpful
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Top reviews from other countries

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Ouson2000
5.0 out of 5 stars Great, but needs more adhesion tape
Reviewed in Canada on December 19, 2023
Size: 2-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
Elena
5.0 out of 5 stars Ya no más frío
Reviewed in Mexico on December 14, 2021
Size: 5-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
One person found this helpful
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Amazon Customer
3.0 out of 5 stars Good
Reviewed in India on November 7, 2023
Size: 2-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
Cliente Amazon
4.0 out of 5 stars Foto ingannevole
Reviewed in Italy on November 7, 2022
Size: 5-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Works perfectly
Reviewed in the United Kingdom on November 14, 2021
Size: 2-WindowsStyle: IndoorPattern Name: Insulator KitVerified Purchase