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The Benefits of Window Insulation Film

window insulation film - Texas Energy Experts

Window insulation film is one way to improve your window’s performance. It is fairly inexpensive and easy to install. But that’s not all. Window films also have one of the highest performances per dollar spent. Let’s take a look at some of the benefits.

What is Window Insulation Film?

Window insulation film, also sold in a window insulation kit, is a plastic sheet that is applied over the window. There are shrink films and static cling films available.

With shrink window insulation films, you will be using double-sided tape and a hair dryer or heat gun.  This creates a tight seal around both the window and the window frame, protecting the home from any drafts and creating an insulated air space between the window glass and your home. Unfortunately, you will not be able to open and close your window after you install the plastic film.

Static cling window films block UV rays and heat from transferring through your window. You will apply it directly onto the window glass only. Therefore, it will not seal any air leaks that may be originating from the window frame, nor does it create an insulated air space. You will, however, still have to ability to open and close your windows.

How Does It Work?

When it comes to thermal resistance, windows are by far the weakest thermal point in a wall. Energy efficiency for windows is measured in U-value. U-value measures the rate of heat transfer.  This is different from R-value, which measures the thermal resistance.  Window insulation film can decrease a window’s U-value, due to the air trapped between the room and the window.

Static cling window insulation film reduces the amount of heat and UV rays that enter through your window. Some films reduce heat transfer of the window by up to 50% and block up to 70% of solar heat gain.  This could significantly reduce your heating and cooling costs! Silver tinted films work better than clear or lightly tinted films but also reduce the visibility through your window.


There isn’t much that can beat window insulation film when it comes to price. It is one of the least expensive options out there. Static cling films are slightly more expensive than the shrink films but still fairly easy on the wallet.

Should You Install Window Insulation Film?

Sealing all air leaks around your windows and doors is imperative for a good energy efficient home, whether you use window film or not. Adding window insulation film will increase your home’s energy efficiency, but replacing drafty, inefficient windows is usually the best option.

If updating your windows are not an option or you are looking for an inexpensive way to increase your window’s energy efficiency, try window insulation film.  It’s a great DIY project.



Photo by Nathan Fertig on Unsplash

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