Haha, my cat does the same—she’ll squeeze herself into the tiniest sunbeam no matter what I do. I totally get you on curtains not sealing out all the light; mine always leave a weird halo around the edges. Have you looked at those magnetic side strips or Velcro things to block the gaps? I’m tempted, but not sure how well they hold up over time.
Have you looked at those magnetic side strips or Velcro things to block the gaps? I’m tempted, but not sure how well they hold up over time.
I actually tried the Velcro strips last summer because the light leaking around my blackout curtains was driving me nuts—plus, I figured it might help with the heat too. Here’s what I noticed:
First, installation was pretty straightforward. Just peel and stick, and then press the curtain up against it. The seal was decent at first, but after a few months of opening and closing the curtains every day, the adhesive started to give up in spots. I ended up having to re-stick them a couple times. It definitely helped with blocking that weird halo of light, but I wouldn’t say it made a huge difference in room temperature.
If you’re mainly after heat reduction, I’d probably go with window film instead. We put some reflective film on our west-facing windows (old house, single pane), and it actually dropped the afternoon temp by a couple degrees. It doesn’t do much for total darkness though—so if your cat’s after those sunbeams, she’ll still find them... just not as intense.
Curtains + film together is probably the best combo for both darkness and heat, but honestly, nothing’s perfect.
I get what you’re saying about the window film, but I’ve gotta say, I didn’t have quite the same luck with it in my place. I live in a 1970s ranch with those giant single-pane windows, and I tried the reflective stuff a couple summers ago hoping for a miracle. It did cut down the glare, but honestly, I didn’t notice much of a difference in the actual room temp—maybe a degree or two, like you mentioned, but it wasn’t the game-changer I was hoping for.
What did make a noticeable dent was actually the blackout curtains, but only after I got the kind that are really thick and hang all the way to the floor. The cheap ones I started with didn’t do much besides make the room darker, but the heavier ones seemed to keep things a bit cooler during the worst of the afternoon sun. Not perfect, but enough that the AC didn’t have to kick on quite as much.
One thing I found is that you really need to make sure the curtains are wider than the window frame, and hang as close to the wall as possible. I actually ended up using some old draft stoppers at the bottom and sides during the hottest weeks—kind of a hacky solution, but it helped keep the hot air from sneaking in around the edges. Not the prettiest setup, but my utility bill thanked me.
The Velcro strips were a bust for me too, especially once the summer humidity hit—they just peeled right off. Haven’t tried the magnetic ones yet, but I’m skeptical they’d hold up any better long-term.
Honestly, I think it’s a combo of things that gets you the best result. Curtains, maybe some film, and plugging up those gaps however you can. Nothing’s foolproof, but every little bit helps when July rolls around and the sun’s baking the living room.
Interesting take on the blackout curtains—I know a lot of folks swear by them, but I actually had the opposite experience in my place. My living room faces west and gets hammered by afternoon sun. I tried a couple different sets of heavy blackout curtains last summer, and while they did block out light, it felt like the heat just kind of got trapped between the curtain and the window, then seeped into the room anyway. Might be because my windows are those old aluminum sliders, so maybe there’s just too much heat transfer happening for curtains alone to make a big dent.
I went back to using a good quality reflective film (the stuff that looks almost like mirrored sunglasses for your windows) and, weirdly enough, that seemed to help more with keeping things from heating up in the first place. Not perfect, but I noticed less of that “oven blast” feeling when I’d walk into the room late in the day. Still have to run the AC, but it kicks on less often.
Guess it really depends on your window type and how much direct sun you get. Sometimes it feels like you’re just fighting physics...
You nailed it with that “fighting physics” line—old aluminum sliders are notorious for transferring heat like crazy, and blackout curtains can end up just trapping that hot air right against the glass. I’ve seen a lot of folks have better luck with reflective film in those situations, especially when direct sun is relentless. It’s not a perfect fix, but it can definitely take the edge off. Sometimes, layering solutions (like film plus lighter curtains) helps a bit, but with those windows, there’s only so much you can do short of replacing them. Still, every little bit helps when you’re trying to keep that AC bill down...
That’s been my exact experience with these old aluminum windows—no matter what I try, they just radiate heat like a toaster. When we moved in last summer, I was convinced blackout curtains would solve everything. Turns out, they made the room darker but not really cooler. By late afternoon, it felt like the air behind the curtains was actually hotter than the rest of the place. I guess it makes sense—just trapping all that sun-warmed air right up against the glass.
I ended up trying one of those cheap reflective films from the hardware store on a west-facing slider. It wasn’t a miracle fix, but it definitely cut down on that “walking into an oven” feeling when I got home from work. The room still heats up, but it’s more gradual, and the AC doesn’t have to run non-stop. I will say, installing the film was trickier than I expected—lots of bubbles at first, and you really have to be patient.
One thing I noticed: lighter curtains actually seem to help more than heavy blackout ones, at least in terms of airflow. If you leave them just a little open at the bottom so air can circulate, it doesn’t get so stuffy. A neighbor told me they put up those cellular shades (the honeycomb kind), and swears by them for insulation, but I haven’t tried that yet—seems pricier.
Replacing the windows is on my long-term wish list, but for now, layering film and lighter curtains is about as much as my budget can handle. Every little tweak helps, especially when you see that electric bill creeping up in July...
By late afternoon, it felt like the air behind the curtains was actually hotter than the rest of the place.
I see this a lot with blackout curtains, especially if they’re right up against the glass. They block light but trap heat, so unless there’s some airflow, you just end up with a hot pocket of air. What I usually suggest is mounting the curtain rod a few inches out from the wall and leaving a gap at the bottom, like you mentioned. That lets the hot air escape instead of building up.
Reflective film can be a pain to install—totally agree about the bubbles. A trick I use is to spray a mix of water and a drop of dish soap on the glass before applying the film. It helps you slide it into place and push out bubbles before it sticks for good.
Cellular shades are great for insulation, but yeah, they’re not cheap. If you’re handy, sometimes you can find them on sale or even secondhand, and they’re not too tough to install. Until then, layering film and lighter curtains is a solid budget move. Every bit helps when you’re trying to keep those old windows from cooking the place.
They block light but trap heat, so unless there’s some airflow, you just end up with a hot pocket of air.
Man, you nailed it with the “hot pocket” thing. Had the same issue—my living room turned into a sauna behind those curtains. I ended up propping them open at the bottom with a broom handle for a while. Not pretty, but it worked. You’re right about the film too, it’s a pain but worth it if you can get it on smooth. Hang in there, every little hack helps when the AC’s struggling.
The “hot pocket” description is spot-on. I ran into the same thing last summer—thought blackout curtains would be a silver bullet, but nope, just a dark, stuffy oven by 3pm. Airflow is such an underrated piece of the puzzle. I tried cracking the window behind the curtain, but then you’re letting in outside heat, which kind of defeats the purpose. Your broom handle solution is genius, honestly. I ended up using a stack of books to keep the bottom open for a while, but it looked ridiculous.
Window film was a game-changer for me, but yeah, getting it bubble-free is a test of patience. I watched like three YouTube videos and still ended up with a few wrinkles. Still, it made a noticeable difference, especially on the south-facing windows. The room doesn’t get nearly as stuffy, and my AC isn’t running nonstop. Only downside is, if you mess up, it’s not cheap to redo.
I think a lot of people underestimate how much heat gets trapped between the curtain and the glass. The glass itself radiates heat inward, and if there’s no airflow, it just builds up. If you can combine film with lighter-colored curtains (or even reflective ones), you get the best of both worlds—less heat coming in and less light, but without turning your space into a sweat lodge.
Honestly, it’s all about stacking little improvements. Nothing’s perfect, but each tweak helps. And yeah, aesthetics sometimes take a back seat when you’re just trying to survive July.
If you can combine film with lighter-colored curtains (or even reflective ones), you get the best of both worlds—less heat coming in and less light, but without turning your space into a sweat lodge.
That’s interesting—has anyone actually tried those reflective curtains? I’ve always wondered if they work or just look tacky from the outside. Also, with window film, did you notice any issues with condensation or trapped moisture? I’m a little skeptical about adding another layer to the glass, especially in older houses where the seals aren’t great. It’s a balancing act for sure... sometimes feels like every solution creates a new problem.