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Whole house fans are great energy savers when used alone or with air conditioning. They can be used at night when air conditioning is turned off, or they can be used alone when temperatures are below 85 degrees F. Some say that whole house fans are effective but noisy. Here is some information about whole house fans and noise:
We had gotten a whole house fan that was very loud. In a previous house we had one that was not loud so we knew they did not have to be. The biggest problem was a loud rattle. From the inside, I did some shimming between the housing and our ceiling which helped some. The BIGGEST help was when I got the idea to tape a paint stirring stick to the attic side of the shutters. Voila, no rattle and I can sleep with the fan on. I think any lightweight, but sturdy stick would work. I used package tape to tape the sticks to the shutters.