3M Indoor Window Insulation Kit, Window Insulation Film for Heat and Cold, 5.16 ft. x 17.5 ft, Covers Two 3x5 ft. Windows

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.

Installation isn't terrible, goes better with 2 people. Would advise putting painter's tape around the window, and applying the 2-sided tape on top of that. This will help the tape stick and protect your paint from peeling when you try to remove the tape. Can definitely notice a few degrees difference in drafty rooms upon applying this stuff.

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.

La caja contiene:Cinta doble lado y plástico delgado para sellar las ventanas.Funcionó a la perfección en época de invierno para la ventana del cuarto de mi hija que se sentía “el chiflón”. Se pone la cinta doble cara en el marco de la puerta y luego se coloca el plástico. Queda sellada la ventana por toda la temporada de invierno. Yo la puse desde Octubre y la quité hasta Marzo. Es una ventana que no hay necesidad de abrir en toda esa época porque el cuarto es frío.Sobró material para el siguiente invierno.Espero te haya servido esta reseña.

This really works! I have an old 1940s home in Victoria with the old sash windows. You could feel the chill coming through them and our heater would run constantly throughout the day, never reaching 20 degrees. If I didn't put a timer on it, it would never turn off!I read a casestudy on this film via the Victoria Sustainability website and it said it does help reduce chill and retain some heat so I thought I'd give it a go. I'm glad I did.Installation is relatively easy. The tape is forgiving so you can pull off the film to restart as you install. I have shutters on the sash windows so the film is completely hidden on the inside, meaning I didn't have to be perfect when sticking the film down. From the outside, you can't even tell it's installed.note: the film doesn't go onto the window glass, it's supposed to stick on a frame, so there is a gap between it and the window glass, essentially acting like double glazing.You can immediately feel the difference. The chill from the windows are gone and my heater is actually stopping now because it reaches the thermostat temperature! I'm already saving money.I expected some effect, but it's surpassed my expectations.Highly recommended!

When applied properly this product stops formation of condensation on windows (good), warms the room slightly (good) and isn't too obvious (good), BUT the double-sided tape provided was such a palaver it made application much slower and more hassle than it should have been. All double-sided tape relies on the backing strip being easy to remove - this wasn't the case here. It left its paper behind, so I had to dig in with thumbnail to get the paper to roll back. A small window (18 inches by 25) took about half an hour when it should have been possible in 5 minutes. It should have come off in 4 strips - my picture shows it actually came off in dozens of much smaller bits, with considerable effort and frustration.