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)

The film is very thin and can easily get pierced by sharp object if not careful. Has to be installed at least an inch away from glass pane to be effective.

Ease of use

One out of 2 packages was completely unusable because the plastic was fused together and although we've used these products for years without any problems, these ones keep coming off. The sticky tape condition was compromised. Have had to order more of the window kits (and pay significant shipping) but hope they arrive in better shape or next time we'll try a different product or order from elsewhere.

I didn’t buy this for a door but rather double windows that are larger than the window package 3M has. This product worked perfectly for the winter months! I didn’t expect it to stay flat as it’s normal for the plastic to become one big bubble when the barometric pressure in the atmosphere rises, so I left some slack in it when applying it. I also did two lines all around the window of the adhesive tape that comes with this item. Also - I attached it to the wall outside of the window, not the window pane as I felt this was better coverage and less likely to leak. One thing that I think most every one can agree on - I wish the adhesive was stickier! Had it not been for the two rows of the tape then it definitely would have come undone.

Lo compré porque decia que el paquete llevababa con dos rollos de cinta. Mi paquete solo tiene una. Era la razon que habia comprado el kit... No podia encontrar solo la cinta. Y ahora, no tengo suficiente para hacer la faena.

I cannot compare to any other year, as only been in this property this winter. I'd heard previous people had had high heating bills, so used this to add to my being efficient. I plan to leave it on all year, for as long as possible. I can comment on application. Yes, a bit of a fiddle, but, do the cutting as best you can,. I laid mine out on clean table, measured, dabbed blacker pen dots to guide my cut. When applying to window, I also carefully cut sticky tape to shape to pass by the window handle section. It worked. The film still adhered tightly. The hairdryer works brilliantly, I scoped the hotair to and fro over the film and stopped when it was taut, not over-taut. After a few weeks, the film attracts a very fine deposit from the atmosphere. Wipe with dry cloth. You really only see this if sun shines directly on it. I watch birds thru this filmed-over window, and it is nearly 100%clarity to look through with binoculars. 1.5 year later update: took it all off, it started to attract tiny black harvest flies behind it. I am impressed it did the job for far longer than I thought it would. A side bit of fun was - when a fly tries to get to the window glass it poings off the plastic like it is bouncing off a trampoline. My old stone house has been insulated now so I may not use this again.

Ottimo