The 8 Best Window Insulation Kits To Stay Warm All Winter

Nothing ruins a cozy winter evening like a drafty window. You can crank up the heat, but that cold air just keeps sneaking in, sending a chill through the room and your energy bill. Before you consider replacing your windows, there’s a much cheaper, simpler fix I swear by every year: window insulation kits.

These kits, usually involving plastic film or foam tape, create an insulating barrier that stops drafts and heat loss. They’re a classic DIY project for a reason. For just a few bucks and an afternoon of work, you can make your home noticeably warmer and quieter.

I’ve tried my fair share of these over the years, from wrestling with giant sheets of plastic to carefully applying foam strips. Here are the best window insulation options I’ve found for 2026 to help you stay toasty all season long.

 

 

Our Top Window Insulation Picks for 2026

3M Indoor Window Insulator Kit

This kit from 3M will run you about $13. It’s my go-to when I have a few standard-sized windows to cover and want a crystal-clear finish.

The best part is how easily it shrinks up with a hairdryer. You get a super smooth, wrinkle-free seal that you can barely see. It really works to block drafts, and the film is surprisingly clear, so it doesn’t mess up your view. I also love that the tape is repositionable for a second before it fully sets, which saved me from a crooked install more than once.

The Downside: The film comes in one big sheet, and cutting it to size for multiple windows without it sticking to itself can be a real pain.

 

 

Duck Brand Max Strength Window Kit

At around $10, this kit is perfect for homes with pets or kids. If you have a dog that puts its paws on the windowsill or a toddler who likes to poke things, this is the one you want.

The film is noticeably thicker and more puncture-resistant than standard kits. I put this on a patio door last winter, and it held up beautifully against my dog jumping on it. The tape also has great adhesion, even on slightly rough painted wood frames where other tapes have failed me.

The Downside: Because the film is thicker, it takes a lot longer with the hairdryer to get all the wrinkles out. You need some patience.

 

 

Duck Brand Shrink Film Window Insulation Kit

For just $8, this is the best window insulation kit if you’re on a tight budget or have a ton of windows to cover. It’s a fantastic value for the amount of film you get.

It does exactly what it’s supposed to do: it stops drafts and creates a pocket of insulating air. The application is straightforward, and the tape sticks well to clean surfaces. For the price, you really can’t beat the performance if you just need basic window weatherproofing.

The Downside: I’ve found that sometimes there are small factory marks or stubborn wrinkles in the film that just don’t shrink away completely.

 

 

3M Outdoor Window Insulation Kit

This outdoor kit costs about $13. You might wonder why you’d put film on the *outside* of your window, but it’s a great solution for extremely windy areas or to prevent frost from forming directly on the glass.

The tape on this kit is seriously heavy-duty and designed to hold up to rain, wind, and cold. The film has the same great 3M clarity as the indoor version. I used it on a basement window that was prone to condensation, and it solved the problem completely.

The Downside: Trying to install a huge sheet of sticky plastic film outside on even a slightly windy day is incredibly difficult. Wait for a calm day.

 

 

Yotache Weather Stripping Foam Seal Tape

This foam weatherstrip kit is different from the others and costs around $20. Instead of covering the glass, this tape seals the gaps in the window frame itself—where the sash meets the sill, for example.

I used this on an older, slightly warped window frame, and it completely eliminated the whistle I used to hear on windy nights. The high-density foam compresses nicely to create a tight seal but still allows the window to open and close. The adhesive is super strong, so it stays put all season.

The Downside: The foam is quite dense, so if your window already has a very tight fit, this might make it difficult to close and lock.

 

 

Frost King Window Insulation Shrink Kit

For about $17, this Frost King kit is a great value if you have lots of smaller windows to insulate. It says it can cover up to nine, which is a lot of bang for your buck.

What I really liked about this kit is that it comes in pre-cut sheets. This is so much easier than trying to measure and cut from a giant, unwieldy roll. The film shrinks up nicely and provides a noticeable reduction in drafts, which they claim can save up to 35% on energy.

The Downside: The included double-sided tape isn’t quite as sticky as the tape from 3M or Duck Brand. Make sure your window frames are extra clean before applying.

 

 

Frost King V73/9H Indoor Shrink Window Kit

This $17 multi-pack is perfect for doing your whole home in one shot. It’s incredibly convenient to have nine individual kits ready to go.

Each kit has a sheet of reliable shrink film and the necessary tape. The process is simple, and the results are immediate. I could feel the difference in the room temperature right after I finished installing them. It’s a great, affordable way to tackle window weatherproofing for an entire apartment or small house.

The Downside: The film in each individual kit is sized for standard windows. If you have a large picture window or a patio door, you’ll need a different kit.

 

 

Duck Brand Indoor Window Insulator Kit

Priced around $10, this is the classic Duck Brand kit that thousands of people (including me) have used for years. It’s a simple, no-frills product that just works.

The kit has everything you need to cover three to five standard windows. The roll-on design makes it easy to apply the film, and it shrinks tight and clear with a hairdryer. It’s a fantastic, low-cost way to reduce drafts and lower your heating bills without much fuss.

The Downside: The film is on the thinner side, so it’s not the best choice for windows in high-traffic areas where it might get poked or torn.

 

 

What to Look For in a Window Insulation Kit

When you’re picking out a kit, the first choice is between shrink film and weatherstrip kits. Film covers the entire windowpane, creating a pocket of still air. Weatherstripping, like foam tape, just seals the cracks around moving parts of the window.

If you have big, drafty panes of glass, a shrink film kit is what you need. If your window frame itself is leaky but the glass is fine, foam tape is the better choice. For really old windows, you might even need both.

Also, pay attention to film thickness. Thicker films, like the Duck Max Strength, are more durable and puncture-resistant, which is great for homes with kids or pets. Thinner films are often a bit clearer and cheaper but are also more delicate. For most situations, a standard thickness will do the job just fine.