Will this work for insulating from the heat of a hot climate too?

I would assume so, though we live in Maine near the coast where it can be in the teens and 20s sometimesduring the weather; I assume it would work since 3M is an excellent product - the hardware versionsdon't seem to work as well. You'll need the 3M tape for this as well.

Has anyone had success applying this to a window without trim? Our 50s track house just has drywall-cased windows.

I want an answer to this too! I also have the drywall-cased windows from the 50s. Thanks!!

I am from the South, so my big question is, does it insulates from heat so well as it does from cold? Will it last if you leave it permanently, or you need to replace it every year? Third question would be, can you glue it against dry wall? Thanks

Old query, but for newbies: this would work as well to keep the A/C air away from the window pane, thus it would insulate heat as well as cold. It's just physics. It forms a dead air space just like a storm window (if you know what those are up north). You could leave it on, but probably would not last permanently. I don't see how you could use glue; it is intended to be mounted only with the double stick tape provided in the box. Browse other replies who have said that they applied it directly to dry wall (sheet rock). BTW another response said: “Yes but you can run into a moisture issue. We tried it and it it worked well except that the A/C created condensation on the plastic which eventually pooled up between the window and the plastic creating mold”

How does this hold up compared to frost king?

This holds up much better then frost king... I have never had frost king last a whole season on my windows but the 3M lasts no matter how long the cold season has lasted. I will never go back to using Frost King again.

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3M Indoor Window Insulation, Insulator Kit for 2 Windows 3ft x 5ft, Keeps Cold Air Out and Warm Air In, Includes Heat Shrink Window Film and Scotch Window Film Mounting Tape (2120W-6)

3M Indoor Window Insulation, Insulator Kit for 2 Windows 3ft x 5ft, Keeps Cold Air Out and Warm Air In, Includes Heat Shrink Window Film and Scotch Window Film Mounting Tape (2120W-6)

Product ID: 12834013

Details

Brand
3M
Global Trade Identification Number
Item Thickness
10 Inches
Material
Plastic
Recommended Uses For Product
Insulating

🔥Keeps warm air in, cold air out

🪟Fits 2 windows (3'x5')

❄️Prevents frost & condensation

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Description

🪟 Seal the chill, save the thrill — your windows’ new winter MVP!

ALL SEASON CLIMATE CONTROL - Blocks cold drafts in winter and helps retain cool air in summer for year-round comfort and savings.
CRYSTAL CLEAR ENERGY SHIELD - Heat-shrink film creates a transparent, wrinkle-free barrier that preserves your view while insulating.
EFFORTLESS PRO INSTALLATION - Includes easy-peel Scotch double-sided tape and a blow dryer step for a flawless, airtight seal in minutes.
TRUSTED 3 M QUALITY DURABILITY - Made in the USA with premium materials that last the entire season and reduce heating costs significantly.
PERFECT FIT FOR STANDARD WINDOWS - Designed specifically for two 3'x5' indoor windows, covering 30 sq ft with a sleek, low-profile finish.

The 3M Indoor Window Insulation Kit is a premium, easy-to-install solution designed to insulate two standard 3'x5' windows. Featuring heat-shrink plastic film and Scotch double-sided mounting tape, it creates an airtight, transparent barrier that reduces drafts, condensation, and frost buildup. This kit helps lower heating bills by keeping warm air inside and cold air out, while maintaining clear views and lasting durability throughout the season.

Specifications

ASIN	B000AXXCUC
Best Sellers Rank	#24,407 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Weatherproofing Window Insulation Kits
Brand Name	3M
Coverage	The coverage of the 3M Indoor Window Insulation Kit is approximately 30 square feet, as it can cover two 3ft x 5ft windows.
Customer Reviews	3.9 3.9 out of 5 stars (15,722)
Global Trade Identification Number	00051131569508
Included Components	62 X 42 in Film, 1/2 X 432 in Tape, (2) 3 X 5 ft Windows
Item Thickness	10 Inches
Item Type Name	Window Insulator Kit
Manufacturer	3M
Manufacturer Part Number	2120W-6
Manufacturer Warranty Description	Warranty
Material Type	Plastic
Model Number	2120W
Recommended Uses For Product	Insulating indoor windows
UPC	051131569508
Unit Count	1.0 Count

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