I was skeptical but it seemed like a cheap and easy solution so it was worth a try. Our powder room is north facing and for the 7-8 years we lived in the house, I would rather go upstairs in the winter than use the close frigid cold washroom on the main level. It was FREEZING in there for half of the year (we keep the door closed because dogs).It took a few minutes to install this film and I can happily report, I can comfortably use the downstairs washroom this cold snowy Canadian winter. I wish I had measured the temperature before and after but it is a significant difference.Definitely worth a try.I will add it to other windows that aren't necessarily problematic but we can feel the cold when we open the blinds because I think it'll save us some energy use. My installation wasn't perfect but it was good enough to work.

Let me start off by saying I did this installation while wearing in a tall cam boot. You know, one those bulky removable casts. Quite cumbersome but this needed to be done so.....When I first removed the film from the box I was confused because it appeared already fully unfolded and it only measured 44" wide. I called the 800# and almost immediately reached customer service. The young lady I spoke with suggested I apply small pieces of tape on both sides of a corner and pull. Low and behold it opened up and I felt a bit foolish. I thanked her and returned to the installation.First I cleaned around the window with alcohol and a towel. I used a second towel to dry it, and then allowed it a few minutes to completely air dry. I applied the double-sided tape around the entire window frame except for the bottom.I folded the film in half to find the middle and started from the top center working my way out to the sides, stopping occasionally to prevent the film from catching the tape on the sides. Then I worked one side at a time from the top, using one hand to pull the film while using the other hand to seal it against the tape.I then took the bottom of the film and folded it up and taped it with scotch tape in a few places to hold it out of the way before applying the last strip of double-sided tape to the bottom of the window frame. Then, starting at the center I pulled the film down a few inches at a time until it attached completely across the bottom and made the final run with my fingers along the edge. I went around the entire window pressing the film against the tape to insure I didn't miss anywhere.Last but not least I used the hair dryer to shrink it. This is the only place I had issues but I believe it's because the wind was blowing briskly and causing the film to stretch while I was applying heat so it wouldn't allow it to shrink. I'll try it again later once the winds calm down and hopefully the heat will work then. I may need a stronger blow dryer.I can't speak to the dependability of the tape or whether or not the film holds up against heavy winds since I just installed it, but it's pretty windy right now and so far so good.If any issues arise I'll update.Update: It's been exactly 60 days and I'm glad to say that the film and tape have both held up great! Usually the wind rips right through the room and because they were so strong the day I installed it I wasn't so sure it would hold up. In fact, every time I tried to use the blow dryer to shrink the film the wind would stretch it out. I finally realized that between the heat and wind blowing in it was allowing it to expand so I stopped and did it once the winds died down and the blow dryer worked as it was supposed to and shrunk the film.As always the winds have been a beast this year but neither the film nor tape have budged. Now I can't help but wonder how much heat and a/c has been escaping through this particular window and I'm seriously considering leaving it up all year around, if for no other reason but to see just how much my electric bill is affected.I'll probably completely change it out every 6 months just to make sure it doesn't weaken with age or fall apart from sun exposure.I highly recommend this product, not only for your comfort but for cutting down on your bills as well!

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.

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.