I've always disliked leaving my garage door open. Inevitably flies, mosquitoes, and other creepy crawly bugs end up in my home.I purchased this air curtain just for my garage, but after the improvement and lack of bugs, I ultimately ended up buying another one for above my French doors off of my master bedroom.The low, to no noise makes this my favorite toy.I'm able to leave it on all day without having to close my doors. It doesn't cool the room, but that's not it's purpose, it does a great job of keeping bugs out and it even works like a wall keeping the exterior temperature out and my interior temperature easy to control.I can see why many businesses use this same technology to address a nuisance that without this type of fan is virtually impossible without keeping the doors closed at all times.