Window film is a thin plastic sheet you stick to the inside of a window to block heat, glare or prying eyes. For renters, the best choice is a static-cling film, which holds on with water instead of glue and peels off cleanly when you move out. With a spray bottle and a squeegee, most windows take about 20–30 minutes.
Quick answer: Ask your landlord first, buy a removable static-cling film, clean the glass well, spray it with soapy water, lay the film on, squeegee out the water and bubbles from the center to the edges, then trim the extra with a sharp blade.
Why window film helps
Windows let in a lot of heat. The U.S. Department of Energy says that in cooling seasons, about 76% of the sunlight that falls on standard double-pane windows enters to become heat (DOE). In winter, about 30% of a home’s heating energy can be lost through windows.
DOE notes that window films help block solar heat gain, glare and ultraviolet (UV) light, which fades floors and furniture. For a sunny apartment in Southern California, that can mean a cooler room in the afternoon and less need to run a fan or air conditioner during the 4–9 p.m. peak, when electricity often costs the most.
What you need
- A static-cling (non-adhesive) window film kit sized for your window
- A spray bottle with water and a few drops of mild dish soap or baby shampoo
- A plastic squeegee or a firm plastic card
- A sharp utility knife with a new blade, plus a straightedge
- A tape measure, lint-free cloths and a glass cleaner without ammonia
How to install window film as a renter
- Get permission. Read your lease and ask your landlord in writing. Ask the film maker or landlord if the film is safe for your glass type, since some films can harm double-pane window seals or void the window warranty.
- Measure and cut. Measure the visible glass and cut the film about 1 inch bigger on every side. You will trim it to fit later.
- Clean the glass. Wash the glass, then scrape off any paint specks with the blade held flat. Wipe again. Any dust left behind will show up as a bump.
- Wet the glass. Spray the whole window until it is dripping wet. The water lets you slide the film into place.
- Peel and place. Peel the clear backing off the film, spraying the cling side as you go. Lay the wet side on the glass and slide it until it covers everything.
- Squeegee. Spray the outside of the film so the squeegee glides. Push water and bubbles from the center out to the edges with firm, overlapping strokes.
- Trim the edges. Hold the straightedge along the frame and cut the extra film, leaving a tiny gap of about 1/16 inch so the film doesn’t touch the frame.
- Let it dry. Squeegee the edges once more and blot water with a cloth. Small hazy spots usually clear as the film dries over the next few days or weeks.
Common mistakes to avoid
- Rushing the cleaning. Most bubbles and bumps come from dust or hair trapped under the film.
- Using too little water. A dry spot makes the film stick before it is in the right place.
- Picking permanent adhesive film. It can be hard to remove and could cost you part of your security deposit.
- Cleaning too soon. Wait until the film is fully dry, then use a soft cloth and a gentle, ammonia-free cleaner.
Frequently asked questions
Can renters put film on windows?
Often yes, as long as the film is removable and your landlord agrees. Static-cling films hold on with water and peel off without leaving glue behind, which makes them the safest choice for rentals.
Does window film really keep a room cooler?
Heat-control and reflective films can block part of the sun’s heat and much of the UV light, so sunny rooms often feel cooler. Decorative frosted films give privacy but usually block much less heat, so check the product’s heat-rejection rating.
How do I get the bubbles out of window film?
Push them toward the nearest edge with the squeegee. If a bubble won’t move, gently lift that corner, spray more water underneath, and smooth it down again.
How do I remove static-cling window film?
Lift a corner with your fingernail or a plastic card and peel it off slowly. Wipe the glass clean. You can save the film by sticking it back on its backing sheet.
See your home energy impact
Want to know how much cooling, heating and lighting add to your bills? Try our free Home Energy Simulator to see where your household uses the most energy and which small upgrades save the most.
Related guides
- How to Make a DIY Door Draft Snake in 10 Minutes
- How to Reverse Your Ceiling Fan Direction for Winter Savings
- How to Draft-Proof Your Mail Slot or Cat Door Yourself
Sources
- U.S. Department of Energy, Energy Efficient Window Treatments
Written and reviewed by the Accessible Sustainability Alliance editorial team. Last updated October 5, 2026.
