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Blackout curtains vs window film for beating the summer heat?

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kevinmitchell406
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- Tried window film once last summer—definitely underestimated how tricky it is to get those bubbles out. Used a library card, but still ended up with a few stubborn spots.
- Spraying soapy water helped a bit, but I got impatient and rushed it... not my best DIY moment.
- With just blackout curtains, my room stayed dark but still felt kind of stuffy. After adding the film, it did seem a bit cooler during the hottest part of the day, maybe by 2-3 degrees.
- Honestly, not sure if it was worth the hassle for such a small temp drop. Maybe if you’re super sensitive to heat, but I might just stick to curtains next time.


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beekeeper88
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- Gotta admit, I’m a bit skeptical about window film too, but I think there’s more to it than just a tiny temp drop.
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“Honestly, not sure if it was worth the hassle for such a small temp drop.”

- In my place (older windows, faces west), the film actually made a bigger difference—maybe 4-5 degrees on brutal afternoons. Not life-changing, but enough to notice when you’re trying to avoid running the AC all day.
- The trick is patience during install... I learned that the hard way. Ended up redoing one window after rushing and getting those annoying bubbles. A rubber squeegee worked better than any card for me.
- Curtains are easier, yeah, but they don’t stop the glass from heating up in the first place. That heat just radiates into the room anyway.
- For anyone renting or on a budget, I’d still lean toward film if you can handle the install. Curtains alone never quite did it for me—always felt like living in a cave and still sweating.
- Not saying it’s perfect, but for some setups (especially windows that get hammered by sun), film plus curtains is way more effective than either alone.


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ppilot55
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I get where you’re coming from—installing film can be a pain, especially if you rush it. I botched my first attempt and had to peel it all off, which was a mess. But like you, I noticed more than just a tiny drop in temp once I did it right. My west-facing windows used to turn the living room into an oven by 4pm, but with film and blackout curtains together, it’s way more manageable. Not perfect, but definitely worth the effort for me. You’re spot on about curtains alone making the place feel dark and still hot... I hated that too. Stick with it—once you get the hang of the install, it’s not so bad.


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(@tpupper18)
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That’s a really solid point about the combo approach. I’ve seen a lot of folks try to rely on just blackout curtains and end up frustrated—like you said, it gets dark but not necessarily cooler. The heat transfer through glass is sneaky; even heavy curtains can’t block all that radiant energy, especially if there’s air leaking around the edges.

Window film can be a pain to install, especially if you’re dealing with older windows that aren’t perfectly smooth. I remember my first go—ended up with bubbles everywhere and had to start over. But once you get the hang of using a spray bottle and a good squeegee, it’s way less intimidating. One thing I’d add: make sure to get film with a decent UV rejection rating. Some of the cheaper stuff only blocks glare, not heat.

It’s not a magic fix, but pairing film with curtains definitely takes the edge off those brutal afternoons. You might still notice some warmth, but it’s a big improvement over just one or the other. The learning curve is real, but after the first window or two, it gets easier... and your electric bill will probably thank you.


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(@donaldl69)
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Couldn’t agree more about the UV rating—people really underestimate how much of a difference it makes. The first time I installed film, I went cheap and honestly, it barely took the edge off. Upgraded a year later to one rated for both UV and infrared, and the room stayed noticeably cooler. It’s not perfect, but like you said, combining film with blackout curtains is a game changer. There’s always a bit of trial and error, especially if you’re dealing with weird window frames or old caulking... but it’s worth it once you dial it in.


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michelle_fox
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It’s not perfect, but like you said, combining film with blackout curtains is a game changer. There’s always a bit of trial and error, especially if you’re dealing with weird window frames or...

Honestly, I actually found blackout curtains alone did more for me than window film. I tried both, but even with a high-rated film, the heat still crept in around the edges and through the frames. Curtains just block everything, light and heat, especially if you get the ones that fit tight. The film helped with glare and fading, but for actual temperature drop, curtains made a bigger difference in my old place. Maybe it depends on window type or sun exposure?


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coder179241
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It really does depend on the windows and how much direct sun you’re getting. In my place, I noticed film alone barely made a dent during peak afternoon heat. Curtains helped, but honestly, adding weatherstripping to the window frames made a surprising difference too. Sometimes the issue’s just leaky frames more than the glass itself.


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(@maggiediver830)
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Weatherstripping, huh? Never would’ve thought of that, but it totally makes sense. I just moved in and honestly, I assumed the glass was the villain here. Now I’m wondering if my windows are just drafty weirdos... Did you have to DIY the weatherstripping or call someone in?


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(@adventure273)
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I’m curious about that too—did you end up tackling the weatherstripping yourself, or did you bring in a pro? I’ve lived in my place for over a decade, and honestly, I still can’t decide if it’s worth paying someone for what looks like a “simple” job. The last time I tried to DIY it, I ended up with sticky foam bits everywhere except where they were supposed to go. Maybe it’s just me, but those kits never seem as straightforward as they look on the packaging.

About the drafty windows—do you notice the air coming in around the frame, or is it more like a general chill in the room? I always thought my old single-pane windows were the main culprit until I realized half the problem was actually the gaps around them. I added weatherstripping and saw a difference, but not a miracle. Still got some heat sneaking in during summer.

I keep hearing mixed things about window film, too. Some people swear by it for blocking heat, but others say it just makes their rooms feel stuffy. Has anyone tried both blackout curtains and window film at the same time? I wonder if doubling up really does anything or if it just makes your living room feel like a cave.

Also, for anyone who’s gone through this—did you notice a bigger difference in winter or summer after sealing things up? Sometimes I feel like I’m chasing drafts year-round and never quite winning.


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(@diy_amanda)
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The last time I tried to DIY it, I ended up with sticky foam bits everywhere except where they were supposed to go.

That’s way too relatable. Even as someone who’s done a ton of installs, those foam strips can be surprisingly finicky, especially if the surface isn’t totally clean. I’ve noticed the biggest difference after sealing up gaps in winter—less draft, less furnace cycling—but summer heat still creeps in unless you tackle the glass itself. For me, window film helped a bit with glare but didn’t do much for actual heat, and blackout curtains made the room feel dark and a little stuffy. Ever tried just thermal curtains? They’re not as cave-like, and you can open them during cooler parts of the day. Curious if anyone’s found a combo that really works for both seasons without making the place feel sealed off.


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