Does putting plastic on windows help keep cold out?

Author: Prof. Braeden Brekke  |  Last update: Monday, July 6, 2026

Cuts Down on Drafts: When installed correctly, plastic window insulation film creates a barrier that reduces drafts, which can help keep your space warmer in winter.

Does putting plastic on windows help in winter?

Window film covers are inexpensive, reduce drafts, help the house feel warmer during winter months, and reduce moisture buildup on the window due to condensation.

Is it better to put plastic on the inside or outside of windows?

If you plan to just put it up for the winter, and want it to be as effective as possible, go over the outer frame for most/all windows. That way, you will block any air leaks around the window, and the greater gap between the film and the window glass improves insulation too.

Does plastic on windows really work?

' we have the short answer for you–no, it does not help you stay cool or save on energy bills. But why? Generally, adding plastic to windows is a practice associated with winter insulation. It helps to create an extra barrier against cold air, reducing heat loss and improving energy efficiency.

What is best to put on windows to keep cold out?

  • 1. Weatherstripping Apply Weatherstripping: Use adhesive weatherstripping tape around the window frames to seal gaps.
  • 2. Window Insulation Kits Plastic Film Kits: Purchase window insulation kits that include clear plastic film.
  • 3. Thermal Curtains Use Heavy Curtains: Install thermal or insulated curta

How to Insulate Windows | Cheap and Easy with Plastic Film

What is the alternative to putting plastic on windows?

Insulating windows without plastic is usually the better method. Outside of simply replacing your windows, you could buy cellular shades, which trap air between the window and the home, add a window film that blocks UV rays and traps heat, or cover your windows with a low-emissivity coating called “low-E.”

How can I stop cold air coming through windows?

Here are eight handy ways to keep cold draughts from coming through your windows.
  1. Secondary Glazing. ...
  2. Insulating Curtains. ...
  3. Draught Snakes. ...
  4. Weather Strips. ...
  5. Strategic Caulking. ...
  6. Window Insulation Film. ...
  7. Window Insulation Tape. ...
  8. Get a Secondary Glazing Quote and Keep Draughts Out of Your Home.

Should you leave plastic on windows in summer?

While window insulation kits are often advertised as a way to reduce heating costs, putting plastic up won't help in the summer either. In fact, it's likely you'll get better results by installing thermal curtains, as they can provide a higher level of window insulation than shrink-wrapping your windows can.

How much can you save by putting plastic on windows?

According to Energy.gov, plastic window insulation can save you 10%–30% on heating and cooling costs. While plastic window sheeting may have some downsides, it is reasonably effective as a wintertime insulator. Here we'll cover the pros and cons of plastic insulation for windows and explain how to install them.

How effective is bubble wrap on windows?

According to the HowToGoSolar, a free online resource geared toward educating homeowners on the benefits of solar power and energy efficiency, bubble wrapped windows show insulating improvements that are 50% better on single-glazed windows, cutting utility bills almost in half.

How to winterize windows from the inside?

How to winterize windows from the inside
  1. Leverage thermal curtains. Thermal window curtains are heavier than traditional curtains and feature a foam lining that offers additional insulation. ...
  2. Use a draft stopper. ...
  3. Install window film. ...
  4. Seal and caulk the windows. ...
  5. Insulate your windows. ...
  6. Consider an upgrade.

Should I put plastic on double pane windows?

The problem lies when it's used as a supplement for functioning windows. For instance, if you have a single pane window or a double pane window with seal failure, it's not energy efficient any longer. Window plastic shouldn't be used to cover up that glaring flaw and we'll explain why below.

Does plastic sheeting keep cold out?

You can inexpensively, temporarily transform a drafty window with plastic sheeting to keep warm air in and cold air out. Plastic window kits are available at most home improvement stores, but you can build your own kit with common household items.

Should you put plastic on the inside or outside of windows?

Installing plastic window film on the inside of your windows is a great option if you're hoping to insulate year-round.

How to keep the cold out of your house?

Properly insulate your windows and doors to prevent cold air from entering your home. Weatherstripping and caulking your home is the most effective way to keep the cold air out. You can also use tape, plastic wrap and towels to seal your windows and doors. Folded newspaper also helps seal door gaps.

Does Saran Wrap help insulate windows?

What's the point of using plastic wrap? Plastic wrap is a great solution to save money when you have drafty windows. Plastic does an excellent job of keeping the heat from escaping if it stays intact. But the problem is, it doesn't always remain intact.

Why not use plastic for windows?

Using plastic on windows as insulation doesn't provide consistent protection against outdoor cold and heat. Building science supports this.

How to put plastic on windows outside?

Window Insulation Film

Leaving up to 1-inch space from the window frame border, apply adhesive tape to the entire window. Lay the plastic film sheet flat and cut accordingly to window measurements. It's recommended to leave up to an excess of 5 inches.

What is the best plastic for windows?

Acrylic windows are ideal glass alternatives when your project includes several large windows. Better Light Transmission: You might be surprised to learn that clear acrylic sheets are more transparent than glass. In fact, clear acrylic sheets allow for more than 90% of light to pass through them!

How to block out the heat from windows?

10 ways to insulate windows for summer
  1. Add weatherstripping to your windows. ...
  2. Use window films to reflect heat. ...
  3. Invest in cellular shades. ...
  4. Purchase blackout blinds. ...
  5. Use draft snakes for window insulation. ...
  6. Insulate windows using bubble wrap. ...
  7. Upgrade to energy-efficient windows. ...
  8. Install insulating shutters.

Does black plastic absorb heat?

The heating process in plastics processing is much quicker for darker materials. The reason behind this is that black plastic absorbs infrared radiation better than white or transparent materials.

Does putting blankets over windows help?

Window blankets are a very effective way to improve heat retention by keeping out drafts.

How to insulate windows to keep cold out?

Some insulation measures may make more of a difference than others, but all 6 help to keep your home warm throughout the colder seasons!
  1. Blinds and curtains. ...
  2. Weather sealing strips. ...
  3. Caulk. ...
  4. Window film. ...
  5. Secondary glazing. ...
  6. Double or triple glazing.

How to put plastic on windows without tape?

Using a spring-tension curtain rod (or two) to hold up the plastic gives a neater result. In addition, these rods are very adjustable and fit a wide variety of window sizes.

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