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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❄️ Stay warm, save smart — your windows’ winter upgrade!

DIY FRIENDLY NO FUSS - Quick, hassle-free setup with included Scotch mounting tape and clear instructions.
CUT YOUR HEATING BILLS - Energy-efficient design reduces heat loss, saving you money all winter long.
TRUSTED QUALITY GUARANTEED - Backed by 3M’s 1-year limited warranty for peace of mind.
SEAL IN COMFORT SEAL OUT COLD - Advanced heat shrink film locks in warmth and keeps frost at bay.
FITS PERFECTLY WORKS SEAMLESSLY - Tailored for five standard 3'x5' windows—no awkward gaps or guesswork.

The 3M Indoor Window Insulation Kit is a clear, heat-shrink film solution designed to fit five 3'x5' windows. It effectively blocks cold air and reduces condensation, helping to lower heating costs. The kit includes mounting tape and easy-to-follow instructions for quick installation, backed by a 1-year limited warranty from 3M.

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Global Trade Identification Number	05113150024217, 00051131500242
Manufacturer	3M
UPC	051131500242
Part Number	2141-EP
Item Weight	10.4 ounces
Product Dimensions	60 x 36 x 0.1 inches
Item model number	2141W-6
Is Discontinued By Manufacturer	No
Size	5-Windows
Style	Indoor
Finish	Clearest window film
Pattern	Insulator Kit
Shape	shape
Item Package Quantity	1
Measurement System	inch
Included Components	1 Folded Film 2 Rolls of Tape 1 Instruction Sheet
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

3M Indoor Window Insulation, Insulator Kit for 5 Windows 3ft x 5ft, Keeps Cold Air Out and Warm Air In, Includes Heat Shrink Window Film and Scotch Window Film Mounting Tape (2141W-6)

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