I’ve heard the airflow can get weird if the roofline isn’t symmetrical or if there’s a lot of framing in the way.
That’s been my experience, honestly. I put in a gable fan at my last place—old 1.5 story, kind of a Frankenstein roof with dormers and some funky framing. The fan definitely helped, but I still had corners where it felt like the heat just sat there, especially over the kitchen addition. I tried moving insulation around and even added another vent, but it never really evened out.
With a low pitch roof, I get why you’d hesitate on a roof mount (I wasn’t thrilled about cutting into shingles either), but for me, the gable setup just didn’t pull air evenly across the whole attic. If you’ve got lots of cross-bracing or odd angles, it’s even trickier.
Honestly, if you’re already adding more soffit vents, that’s a solid move either way. But yeah, unless your attic is super open and symmetrical, I’d be wary of relying only on gable fans to do all the work. Just my two cents from sweating through a few summers...
Yeah, I’ve run into the same thing—my attic’s like a maze with all the weird framing and it’s amazing how stubborn hot air can be. Ever try just sticking a box fan up there for kicks? Didn’t help much, but at least I felt like I was doing something. How’s your insulation holding up in those dead spots? For me, it always seemed like the heat would find the one corner I didn’t touch.
I actually tried the box fan trick too, but honestly, I think it just moved the hot air around instead of getting rid of it. For me, the bigger difference came when I sealed up some of those weird gaps in the insulation—especially around the soffits. I’m not convinced attic fans do much unless you’ve got solid airflow paths set up already. Otherwise, they just pull conditioned air from the house, which isn’t great for the energy bill.
Totally get what you mean about the box fan—mine just made the attic feel like a convection oven. I went with a gable fan last summer because it was way cheaper and didn’t involve cutting holes in my roof (which, knowing my luck, would’ve led to leaks). But honestly, sealing up those weird gaps and making sure the soffits were clear made a bigger difference than the fan itself. If your airflow’s not dialed in, the fan just sucks your AC out and your wallet cries a little.
But honestly, sealing up those weird gaps and making sure the soffits were clear made a bigger difference than the fan itself.
I’ve got to agree with this more than I expected. I put in a roof-mounted fan a couple years back, thinking it’d be a game-changer for summer heat. It did help, but not nearly as much as just getting the attic sealed up tight and making sure my soffit vents weren’t blocked by insulation. The fan was basically just pulling conditioned air from the house until I sorted out those leaks—felt like I was cooling the neighborhood.
I get the hesitation about cutting into the roof. I was nervous about leaks too, especially since my shingles are getting up there in age (18 years). Gable fans are definitely less invasive, but they don’t always move air as evenly if your attic’s layout is odd or you’ve got limited venting on the opposite side.
Honestly, if someone’s attic isn’t sealed and vented right, neither fan setup is going to do much except run up your electric bill. If you’re going to pick one, I’d say start with airflow basics before dropping cash on any fan.
