this post was submitted on 01 Jul 2025
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[–] tetris11@lemmy.ml 85 points 1 week ago (6 children)

One way window heat shield. Reflects 85‰ of the UV back out. Sticks to the window using only water.

Noticeable difference in temperature for any sun-facing windows

[–] wiccan2@lemmy.world 22 points 1 week ago* (last edited 1 week ago) (2 children)

I did this at my last House and it was fantastic.

Just need to remember that once it's dark outside the reflective side "switches" and everyone can see clearly into the house.

[–] SSUPII@sopuli.xyz 33 points 1 week ago (1 children)

That's just how a normal window works

[–] wiccan2@lemmy.world 32 points 1 week ago

Yes but the film has a one-way mirror effect and most people don't put 2 and 2 together and think the window is opaque when is not.

[–] tetris11@lemmy.ml 10 points 1 week ago

wait really? and isn't that always the case with any window?

[–] Little8Lost@lemmy.world 12 points 1 week ago* (last edited 1 week ago)

Somewhere i worked had that. (Edit: but more for privacy)
It was so funny seeing passerbys using it as a mirror.
Absolutly funny 10/10

[–] FlashMobOfOne@lemmy.world 7 points 1 week ago

Window film is so glorious. I have my bedroom windows blacked out with it, easier to sleep, and yes, always cool temperatures in there.

[–] thermal_shock@lemmy.world 5 points 1 week ago

I added these last summer too. Roughly a hundred bucks to cover three patio sliding doors. Huge difference.

[–] Korhaka@sopuli.xyz 5 points 1 week ago (2 children)

How easy are they to cut to size, or if you need to use multiple to cover a window how does the gap/seam look? Have been thinking of getting them, but we also want to replace our windows at some point. I assume you can't just reuse them?

[–] tetris11@lemmy.ml 6 points 1 week ago* (last edited 1 week ago) (1 children)

Pretty easy to cut, but of course it'll never be perfect, and it's better to cut smaller than larger since it sticks to the window using water, and needs a complete seal, so any corners that overlap a frame will just slowly force the whole thing to peel off.

Very easy to re-use, it sticks using water and requires a flat piece of card (e.g. an old credit card) to spread it out over the window

[–] Korhaka@sopuli.xyz 1 points 1 week ago (1 children)

Is that the static type then that are reused and just need water, with adhesive backed ones being single application only?

[–] tetris11@lemmy.ml 4 points 1 week ago* (last edited 1 week ago)

Huh, never heard of the adhesive type. I've used the static/water ones for ~4 years without any issues

[–] masinko@lemmy.world 6 points 1 week ago

At least in home depot, some of them come with a specific blade tool, or one that's not too much more expensive. It's hard/sharp enough to seamlessly cut through the tints, but not scratch your window.

[–] Leax@lemmy.dbzer0.com 4 points 1 week ago (1 children)

Are you using these on double glazed windows? I've read this film could get them to crack under the heat.

[–] tetris11@lemmy.ml 3 points 1 week ago (1 children)

Yeah double glazed, and no hasn't been an issue by my reckoning

[–] Leax@lemmy.dbzer0.com 3 points 1 week ago

Thanks that's good to know!