Best Weatherproofing Window Insulation Kits of 2025

"I found the installation to be very simple. However, I did have to be cautious when removing the tape, as it took some paint off my wall."

"After moving into a new house, I noticed that one window was letting in cold air. I opted for this product due to its price, and I'm thrilled with the results. It's made a dramatic difference in keeping the cold out, though I did find it a bit tricky to install alone."

"Despite my efforts, I struggled with this product. The tape was hard to adhere, and the film felt flimsy. I tried multiple times to get it to work, but ultimately, I found it ineffective and a waste of money."

"For years, I've used the King Frost kits, but now Duck MAX is my go-to. The thicker plastic and better double-sided tape make installation a breeze. I love that it comes on a roll, making it easier to cut and fit for my long kitchen window. Once attached, unfolding and pressing it against the frame is straightforward. It's truly easy, peasy lemon squeezy!"

"Living in New England with older windows, I've found this product to be fantastic for sealing in heat. It's incredible how the plastic visibly reacts to the wind, showing just how effective it is. Installation was simple, and I made sure to clean the area for the tape, which stuck perfectly. I highly recommend it!"

"I initially had doubts about the quality based on reviews, but this product really delivered for my travel trailer windows. During our renovation, it significantly improved insulation and was a piece of cake to install. As a carpenter, I can confidently say it's a great product that I would definitely recommend and repurchase!"

"I found the installation to be mind-blowing. It was much easier than I expected. Using a hair dryer to smooth out the plastic was particularly satisfying, and now I can barely tell there's a cover on the window."

"After moving into my 1910 house, I was desperate to block the cold drafts from my original windows. I initially thought these would be temporary, but they actually made the rooms feel much more comfortable. I wish I'd done some weather stripping first, though."

"I was hesitant to buy this because I thought it would be hard to apply. But I managed to do all my windows in just a day! It feels great to save money on my electricity bill, and now I can splurge on more lip glosses."

"I've been using plastic on my windows for nine years. Even with newer windows, the amount of cold air I stop is astonishing, saving me at least $90 in heating costs during the coldest months. I noticed the effect immediately in my four-season porch; the floor felt warmer and heated up much faster. Although I prefer 3M plastic, Duck offers great value at less than half the cost. So far, it has performed well!"

"Even though I followed the instructions, my first window didn't turn out perfectly. Despite that, it worked right away, and I could feel the difference before starting the next one. I thought I needed the max strength option, but this product is doing an amazing job at retaining heat and sticking well. I definitely recommend it!"

"Living in Canada, my sunroom used to be freezing. After installing this product, I was astounded by the results. I ended up applying it to two more windows, and it has made a huge difference. Now, the whole house is warmer, and the furnace runs less often. I can't wait to see the reduction in my power bill; I bet it pays for itself within the first month. Highly recommend!"

"I got this to reduce condensation on windows during winter. It works well at 68 degrees F and 60-70% humidity. Compared to Duck Brands, it's more transparent and feels more rigid. I discovered that I can shrink it with a hair dryer to eliminate wrinkles, which is not mentioned in the instructions. I'm using it indoors, which seems fine."

"I've been using this weatherproofing kit on our outer windows for 20-25 years. It significantly reduces our natural gas bill and increases comfort. I always buy an extra roll of tape to ensure a tight application after learning that lesson the hard way. Cleaning the surface before applying is crucial for it to last through harsh weather."

"This product did not stay on my door when exposed to weather and wind. While it was easy to apply, it unfortunately blew off."

"I always choose 3M window film when I find it. It's super clear and sticks much better than other brands. I just applied it to my bay window in the kitchen because I was tired of the cold breeze while doing dishes. It was easy to install and solved my draft problem."

"This product is easy to put up and has effectively blocked the breeze from my broken window."

"I've relied on this product for years in Minnesota. It's simple to apply and remove. Now, I'm using it in Arizona for the summer monsoon months, and it works great."

"I found it super easy to work with, and it made an immediate difference in reducing airflow around my windows."

"Once I applied the film, it did a wonderful job of preventing drafts. It's amazingly strong and really shrinks with heat. However, I did have to buy extra tape since there wasn’t enough included in the package."

"I used to rely on 3M’s Crystal Clear window film, but what I bought recently was disappointing. The clarity isn't what I expected, and it doesn't shrink tightly as it should."

“I have used this product for years to cover my windows and French doors. The new roll-on feature makes the process much simpler! Proper cleaning is crucial for the tape to stick well. I recommend using rubbing alcohol for a thorough clean. After applying the tape, I always warm it with a hair dryer to ensure a tight seal. This method minimizes puckering and keeps everything clear and tight. If you follow the steps carefully, you’ll get great results.”

“Overall, I think this product is a fantastic idea, but I wish the tape was stickier and the material a bit more durable. You might find yourself changing it more than twice a year due to weather impacts, but I still highly recommend it. It's effective and does the job!”

“I found this product to be well-priced and easy to use. If you clean the window frames properly, the installation is straightforward, usually taking about 15 minutes for a large window. You can really feel the difference once applied. While it does create a slight aquarium effect on larger windows, it works excellently on smaller ones and significantly cuts down on cold drafts.”

“I recently moved into an old house with drafty windows upstairs. This window insulation kit really helps in the winter. You can feel a big difference right away. The plastic is easy to work with, and the two-sided tape is wide enough to stick, unlike the two-sided tape in some other brands. It's a good price and a great product.”

“We recently purchased a 114-year-old home in a historic district. The single-pane windows leak and we could feel cold air being pulled into the house. The insulation kit took us about 20-30 minutes for each window. We were really surprised at how well this worked. We no longer have cold air seeping into our home and it’s surprisingly warmer in each room after applying the film. I highly recommend this kit for anybody that has leaky windows.”

“I seal my windows every year and have tried a few brands. I got this one this year and am very happy with the results. The tape sticks really well but also comes off easily without damaging the paint, and the effects are already noticeable. I am very happy with this product and it will be my go-to next year if we need more.”

"I purchased this plastic shrink wrap for my 1950s home, which struggles with condensation every winter. After using this product, I noticed no more moisture or mildew on my windows. I also found that installing the plastic while the weather was warm made a significant difference in adhesion. I would definitely buy this again!"

"As an ultralight backpacker, I opted for this product as a budget-friendly groundcloth. It performs well—lightweight, waterproof, and durable enough for careful use. The only downside is its slight crinkliness, which I handled by adding blue tape in the corners for visibility. Overall, it meets my expectations."

"I had a challenging experience installing this plastic on a large window facing the sun. I struggled a bit during the installation, but ultimately, it worked great. I learned to only peel the plastic off the tape when ready, to avoid a mess. So far, it’s doing its job well, and I’m hopeful for the hottest months ahead."