How to Insulate Windows with Bubble Wrap

Bubble wrap window insulation is a surprisingly effective, nearly free hack for reducing heat loss through single-pane windows. It's not pretty, but it works — and it's completely reversible. Here's how to do it.

Does Bubble Wrap Actually Insulate Windows?

Yes — surprisingly well. Each bubble is a pocket of trapped air, and air is an excellent insulator. Studies have shown bubble wrap can reduce heat loss through a single-pane window by up to 50%. It also lets in diffused light, so the room doesn't go dark.

What You'll Need

• Bubble wrap (large bubbles work better than small)
• Spray bottle with water
• Scissors

Step 1: Cut the Bubble Wrap to Size

Cut pieces of bubble wrap to fit each window pane. Cut slightly larger than the pane — you can trim after applying.

Step 2: Mist the Glass with Water

Spray a light mist of water onto the glass surface. This is the "adhesive" — the water creates surface tension that holds the bubble wrap against the glass without any tape or glue.

Step 3: Apply the Bubble Wrap

Press the bubble wrap against the wet glass with the bubble side facing the glass. Smooth it out with your hand. It will stick immediately and hold firmly.

Step 4: Trim if Needed

Trim any excess bubble wrap with scissors for a neater appearance.

How Long Does It Last?

Bubble wrap held by water tension typically stays in place for the entire winter season without re-wetting. If it starts to peel at the edges, mist with water again and press back into place.

How Effective Is It?

• Reduces heat loss through single-pane glass by approximately 50%
• Eliminates cold drafts from the glass surface
• Lets in diffused light (about 50–70% of normal light)
• Blocks the view — best for windows where privacy is acceptable

Best Uses for Bubble Wrap Insulation

• Basement windows
• Garage windows
• Bathroom windows (privacy is a bonus)
• Utility room windows
• Any window where view is not important

Removing in Spring

Simply peel the bubble wrap off the glass. No residue, no damage. The bubble wrap can be reused next winter if stored flat.

Bubble Wrap vs. Shrink Film

• Bubble wrap: Free (if you have it), blocks view, easy to apply, reusable
• Shrink film: $3–4 per window, nearly invisible, professional appearance, slightly more effective

For living room or bedroom windows where appearance matters, use shrink film. For utility spaces, bubble wrap is an excellent free solution.

• Frost King Indoor Shrink Window Kit 42"x62" 9-Pack — the clear alternative to bubble wrap for windows where appearance matters