I have had a large belt-driven whole house fan in my hallway ceiling for about 4 years now, and I love the cool breeze it brings in, but in the evening when I wanted to watch TV in the family room, I had to turn off the whole house fan in order to hear the TV.
When I first heard about the QC-1500, I thought I would buy one and try it out in my family room.
It worked so well and was so quiet, I bought 3 more and installed one in each bedroom. I am able to turn on all 4 QC-1500's at the same time, get a nice rush of cool incoming air, and can't even hear them. I love them.
Needless to say, I never even turn on the big belt-driven unit any more.
Ron S.
Murrieta , CA