Finally got my attic temps under control—here's what worked

- Radiant barrier foil: installed it with my uncle last year (Midwest, old house). Noticed maybe a 5-7 degree drop in attic temps, but nowhere near the wild 30-degree claims. Install was sweaty but not too complicated—just awkward angles. Not snake oil, but not magic either.

- Squirrels: tried everything short of hiring a falcon. Mesh helps, but they’ll chew through cheap stuff. Ended up using hardware cloth with metal flashing behind it—so far, no new holes. They’re relentless, though... I swear one gave me the stink eye from the power line last week.

- If you go for radiant barrier, staple it tight and keep airflow behind it. Otherwise, it just sags and collects dust. Not a miracle cure, but every little bit helps, right?

Radiant barrier’s one of those things I keep going back and forth on. I get that it’s not total snake oil, but I’m still not convinced it’s worth the hassle for everyone. I tried the staple-up foil in my attic last summer (Chicago burbs, 1950s ranch), and honestly, the temp drop was barely noticeable—maybe 3 degrees on a good day. My AC didn’t seem to run any less, either. Could be my insulation’s already decent, or maybe my attic just isn’t the right setup for it. Either way, I’m not sure I’d bother again unless I was already up there doing something else.

The dust thing is real too. Mine started looking grimy after just a few months, and once it sags, it’s basically useless. I read somewhere that if you don’t have good soffit-to-ridge airflow, you’re just trapping heat up there anyway. Maybe it works better in places with more sun or different roof pitches? Midwest summers are brutal, but our winters are worse, so maybe that’s part of it.

On the squirrel front—totally feel your pain. We had one chew through our fascia last fall and set up shop in the insulation. Tried peppermint oil, fake owls, even a motion sensor sprinkler (which mostly just soaked me). Ended up paying for a pro to seal everything with steel mesh and metal flashing like you said. Haven’t seen them since, but every time I hear scratching I get paranoid all over again.

I guess my takeaway is: radiant barrier might help a bit if your attic’s a sauna and you’ve got nothing else going on up there, but don’t expect miracles. Squirrels though...those little jerks are basically immortal unless you go full Fort Knox on your house.

Totally hear you on the radiant barrier not being a magic fix, especially in the Midwest where you’re battling both extremes. I’ve seen similar results—maybe a couple degrees difference, but nothing life-changing. If your insulation’s already solid, the returns just aren’t that dramatic. Honestly, I’ve had better luck with a combo of dense-pack cellulose and a lighter-colored roof. Green or “cool” roofing materials made a bigger dent in attic temps for me than any foil ever did. And yeah, squirrels...I swear they’re plotting against us all.

Honestly, I’ve had better luck with a combo of dense-pack cellulose and a lighter-colored roof. Green or “cool” roofing materials made a bigger dent in attic temps for me than any foil ever did.

I’m with you on the cool roof making more of a difference than radiant barriers. Here’s how I usually approach it: First, check the insulation depth—if you’re already at R-49 or higher, adding more rarely pays off. Next, look at ventilation. Ridge vents plus soffit vents can drop attic temps by 10+ degrees if they’re actually clear (I’ve found bird nests blocking more than once). Only after that do I even consider radiant barriers, and honestly...like you said, it’s rarely dramatic.

Squirrels are another story. I’ve had them chew through ridge vent foam and even gnaw on wiring. Trapping and sealing every tiny gap is the only thing that’s worked for me, but it’s an ongoing battle.

Radiant barriers actually worked out better for me than I expected, but maybe that’s just a weird quirk of my house. I’m in central Texas, and our attic is like a sauna from May through September. I went the usual route first—added blown-in cellulose, put in a new ridge vent, even crawled around making sure the soffits weren’t all plugged up with old insulation. But honestly, I still felt like the AC was running non-stop.

I finally gave in and stapled up radiant barrier foil under the rafters. I know people say it doesn’t do much, but I swear I saw a bigger drop in attic temps than just with the insulation and vents. Maybe it’s because my roof faces dead west and just bakes all afternoon? It wasn’t a miracle fix, but it made the upstairs bedrooms a lot more bearable. Not cheap or fun to install, though—ended up with fiberglass in my shirt and a sore neck for a week.

I do agree about the cool roof—wish I’d gone lighter when I replaced the shingles. Mine are still dark gray, so maybe that’s part of why the radiant barrier seemed to help more? I guess it really depends on your setup. And squirrels...ugh, don’t get me started. One chewed right through my new vent screen last fall. I patched it up with hardware cloth, but I’m half expecting to hear them doing gymnastics up there again any day now.

Long story short, I wouldn’t totally write off radiant barriers, especially if your roof’s a heat magnet. But yeah, ventilation and insulation are the real MVPs. Just my two cents from the rookie homeowner trenches.