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3M Indoor Insulator Kit, 2-Window

by 3M
4.2 out of 5 stars 1,417 customer reviews
| 200 answered questions

Price: $4.98 & FREE Shipping on orders over $49. Details
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • Enter your model number above to make sure this fits.
  • Included: (1) 5.16' x 7', (2) rolls of tape each 1/2" x 500"
  • Insulates two 3' x 5' windows
  • Lowers heating costs and saves energy
  • Applies easily, shrinking tight, wrinkle-free and clear on glass
  • Increasing the R-value of single pane window by 90%
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The Add-on program allows Amazon to offer thousands of low-priced items that would be cost-prohibitive to ship on their own. These items ship with qualifying orders over $25. Details
38 new from $0.49

Improve your home in time for spring Improve your home in time for spring

$4.98 Add-on Item & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • 3M Indoor Insulator Kit, 2-Window
  • +
  • 3M Interior Transparent Weather Sealing Tape, 1.5-Inch by 10-Yard
  • +
  • 3M Indoor Insulator Film Mounting Tape, .5-Inch by 13.8-Yard
Total price: $13.71
Buy the selected items together

Special Offers and Product Promotions

Style: Indoor | Size Name: 2-Window

Product Description

Style: Indoor | Size Name: 2-Window


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 two 3-foot-by-5-foot windows.

At a Glance
2120W Indoor Two-Window Insulator Kit
At a Glance:

  • Window insulation film to insulate two 3-foot-by-5-foot windows

  • Double-sided mounting tape with ready-to-peel liner

  • Transparent, wrinkle-free fit

  • Backed by a limited warranty
At a Glance

2120W Indoor Two-Window Insulator Kit
The 3M indoor window insulator kit provides an airtight seal to keep the heat in and the cold out (click to enlarge).
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-12-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 4 square yards, or 5.16 feet by 7 feet by 0.75 thousandths of an inch (H x W x D), and weighs 0.13 pounds.

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

2120W Indoor Two-Window Insulator Kit 2120W Indoor Two-Window Insulator Kit 2120W Indoor Two-Window Insulator Kit
This insulator kit is easy to install, and a blow dryer enables you to remove wrinkles for a transparent view (click each to enlarge).

From the Manufacturer

Get your home ready for winter with 3M energy solutions. Our window insulator kits are easy to install, and help keep your utility bill low during the cold months. Plus they use Scotch Window Film Mounting Tape and have the clearest film. The cost of heating your home may be rising, but there's something you can do. 3M window insulator kits help keep the warm air in and cold drafts out. And your energy bill down.

Product Information

Style:Indoor  |  Size Name:2-Window

Technical Details

Part Number 2120W-6
Item Weight 11.2 ounces
Product Dimensions 1.8 x 8.8 x 1.5 inches
Item model number 2120W
Size 2-Window
Color Clear
Style Indoor
Item Package Quantity 1

Additional Information

Customer Reviews
4.2 out of 5 stars 1,417 customer reviews

4.2 out of 5 stars
Best Sellers Rank #72,933 in Home Improvements (See top 100)
#92 in Home Improvement > Building Supplies > HVAC > Weatherproofing > Window Insulation Kits
#468 in Home Improvement > Hardware > Window Hardware
#5,067 in Home Improvement > Contractor Supply
Shipping Weight 11.2 ounces (View shipping rates and policies)
Date First Available February 16, 2006


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By J. Small on January 21, 2008
Style Name: IndoorSize: 5-Window
It's smart for a couple reasons. Of course, the concept is simple: trap the air between the glass and the room and the air becomes the insulator. But it's all in the implementation and that's where this product shines. It uses double-sided tape that isn't so sticky that it will pull of paint when removed. Have to get that right and they did. The real attention to detail is the film material. When installed, it better not look tacky. So they formulated the material to shrink just enough to tighten it up to pull out the hard and soft wrinkles, but not pull away from the tape! Don't worry if the tape and the film lie on perpendicular planes. The film won't pull off when it shrinks. It's resilient enough not to overcome the film-to-tape adhesion. Again: brilliant.

It is also optically clear, not at all diffusive. That is another absolute must. I was simply amazed at how this product brings all this together into a cheap, effective solution to drafty old windows. Someone reviewed that the tape wouldn't stick to their window frame. Probably a surface prep issue. In my application the paint was new and firmly bonded. I even had strongly curved surfaces to tape over. I found that heating the tape with a hair dryer helped conform it to those surfaces. Directions don't address that issue and for flat surfaces it's not one. This is a great product!
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Style Name: IndoorSize: 5-Window
This kit makes it easy to quicky insulate just about any reasonably sized window you may have. The kit includes one large sheet of plastic and 2 rolls of double sided tape. You apply the tape around the frame of the window you want to insulate, cut a piece of plastic and then apply it to the tape. Once you've done that you just need to use a hair dryer on the plastic to get it to shrink and tighten in your window frame.
I used these kits to seal drafty windows in an old building. It took a little over an hour to cover 4 windows. The temperature difference is dramatic and when the plastic has been well tightened and trimmed it isn't too noticable.
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Style Name: IndoorSize: 1-Patio Door Verified Purchase
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.
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Style Name: IndoorSize: 5-Window Verified Purchase
This is a great product, but what do you do if you have window shades or curtains that go across the window between the inside trim pieces? All the videos I have seen show the film being placed across the front of the entire window casement. You can do that, but then you can't adjust the window shades.

I installed this product on 10 windows having shades, and after the first one, when I made all the mistakes, I was able to do them in 5-10 minutes each. Here's how (and how to avoid the mistakes).

First - and this applies to any window - realize that when you first roll out the film to cut it, you are cutting to the width of the window (+2 inches). When you unfold the film after cutting, it unfolds to 5 feet, the maximum length of the window. After you install the film, you can trim off the leftover film at the bottom of the window.

Start by cleaning the wood surface with alcohol. This is not part of the packaged instructions, but it will surely help the tape to stick. Also, don't expect it to stick to flaky or badly alligatored paint. Now apply the tape. You will be going around the inside of the window: across the bottom sill (facing up), up one side (facing the other side), across the inside of the top (facing down), and down the other side (facing the first side). Do not start the tape in a corner, or you will have a tough time lifting and pulling off the tape covering. Start in the middle of the bottom sill and go all the way around the inside and back to the start. Before you finish the taping, pull up the covering from the start of the tape (with a fingernail or the edge of a knife blade, then finish the tape by overlapping the start by a half inch.
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