Mine are both on right now, I'm sitting in the less than 20 feet away from them, and I don't hear anything at all.
But, when that attic fan is on, it's very noticeable.
If a large amount of units are being sold, you have to take "horrible reviews" with a grain of salt.
Since there might be thousands of happy owners who didn't write a review..
Plus, a product like this one, where people might want to do a large percentage of the work themselves,
You might get some 'pro' installers writing negative reviews, for their own personal reasons.
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My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
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