To apply it, you first attach the included double-sided tape to your window frame, measure your window and cut the film to size, press it onto the tape, and then shrink it with a blow-dryer so it adheres to your window. Some reviewers say they improved the process by working out bubbles with a credit card as they went.

Promising review: “After having used a hardware store’s brand of this for years and dreading the install every year, I purchased Duck Brand this fall, and can’t believe how much easier it was to install! This is thicker than what I used before, and the tape stuck so much better! Also, the film is really good and clear. It’s a good idea to use an alcohol wipe before you install the tape, and then press it down really well (I let it sit for a while, too) before pulling off the tape liner. I did three windows by myself in just over an hour. Very pleased with this brand and will buy it again next year for sure! I’m very pleased.” —Trillion

Get a five-window kit from Amazon for $16.70 (also available in other kit sizes). 

Source: https://www.buzzfeed.com/jenae_sitzes/products-for-winter-if-youre-always-freezing