3M 2141W Indoor 5-Window Insulator Kit

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.


Designed with Attention to Detail   January 22, 2008
J. Small (Midwest USA)
36 out of 38 found this review helpful

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!




Great product, easy to install   February 11, 2007
Jen McClurg (Knoxville, TN)
25 out of 28 found this review helpful

I've spent the first part of this winter suffering because of drafty windows in the bedrooms of my new (old) home. I found this insulation kit from 3M, ordered it on Monday and it arrived on Thursday! In about 1 hour I had 4 windows sealed. I found it simple and straightforward to follow the instructions and it worked exactly as described. It's noticeably warmer in my bedroom, and I haven't adjusted the thermostat.

One note however, there was only enough plastic to cover 4 windows, not 5, and my windows are almost exactly the size given on the label. It was okay though, I covered the 4 worst offenders so it wasn't that big a problem for me.


It's keeping me warm right now   March 2, 2009
The Doughboy (Atlanta, GA United States)
10 out of 11 found this review helpful

The package has all the pieces you need to seal your windows: plastic film and double-sided tape. You'll have to provide your own tools: scissors or an exacto knife and a hair dryer.

If you have unusually-sized windows (I do), I strongly advise measuring them and making sure you get enough plastic and tape to cover them. The product description indicates this item comes with a 62-inch by 210-inch sheet of plastic. You'll have to cut it to apply it to the windows.

I used this product to seal three very large windows in my home office. It's a chilly and poorly-insulated room, but it's been a lot better this winter, thanks to the window insulator kit.

From outside the building you can't tell the windows are sealed. From inside, you can see through the windows fine, but you can see a bit of excess plastic around the windows. It's very minor and is worth the trade-off to keep the room warmer.


Great Winterizing option   November 24, 2007
S. Myre
9 out of 10 found this review helpful

Excellent product. Made a big difference in my drafty apartment! Easy to install as well - though I recommend tag-teaming the project with someone. Goes much faster that way.