- I get the hesitation about cutting into a newer roof. Mine’s only 3 years old and I just can’t bring myself to poke holes in it, especially after seeing what a mess my neighbor had with leaks after his install.
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— This is exactly what worried me. My attic floor’s got some gaps around light fixtures and pipes, so I figured a fan would just suck AC right out.“isn’t there a risk of pulling conditioned air from the house if the attic floor isn’t sealed perfectly?”
- Decided to beef up insulation first. Noticed the upstairs stayed cooler, and my summer bills didn’t spike.
- Never measured temps before/after, but honestly, insulation alone made a bigger difference than I expected. Still not sure I’d trust a fan unless every gap was sealed tight.
I get the concern about leaks, but honestly, I think roof-mounted fans get a bit of a bad rap. If they’re installed right—good flashing, proper sealant—they shouldn’t cause issues, even on a newer roof. Gable fans are easier to add, sure, but they don’t always move air as efficiently if your attic’s layout is weird or you’ve got limited venting. Insulation’s great (and definitely helps), but in humid climates, sometimes you just need to move that hot air out fast. I’d still consider a fan if the attic gets crazy hot... just double-check the install and maybe tackle those gaps first.
I’ve managed a few buildings where we went with roof-mounted fans, and honestly, as long as the roofer knew what they were doing, leaks weren’t an issue. One place had a low-slope asphalt shingle roof and we used a high-quality flashing kit—never saw a drip, even after some nasty storms. Gable fans are definitely easier to swap out or service, but I’ve noticed they sometimes struggle if the attic’s chopped up with dormers or weird angles. Curious—has anyone tried solar-powered fans? I keep hearing mixed things about their airflow, especially in bigger attics.
Curious—has anyone tried solar-powered fans? I keep hearing mixed things about their airflow, especially in bigger attics.
I put in a solar attic fan last summer—mid-size, supposedly rated for 1,200 sq ft. My attic’s about 1,000, so I figured it’d be enough. It does move air, but honestly, on overcast days or late afternoon, the airflow drops off a lot. Not sure I’d rely on it for a really big or complex attic. Has anyone tried running two smaller solar units instead of one big one? Wondering if that helps with coverage in odd-shaped spaces.
I actually tried two smaller solar fans in my parents’ old house, which had a weird L-shaped attic. We put one on each “wing” thinking it’d help with dead spots. It did even out the airflow a bit, but honestly, on cloudy days both would slow down at the same time, so coverage wasn’t perfect. If your attic’s got odd corners or partitions, splitting up the fans might help, but you’ll still run into the same sunlight limitations. I kinda wish we’d gone with a hybrid (solar plus electric backup), but that was out of budget.