Windows should be opened in all the rooms that are to be cooled and the air path to the whole house fan not obstructed by tightly closed doors or other means. In either case, a security concern may necessitate the use of barred window guards. These extra expenses can significantly delay a payback on energy savings. When the outdoor temperatures are below 82 degrees and the relative humidity is less than 75 percent, a whole house fan can cool a house by itself. Use a fan with variable air flow.
Larger fans are generally quieter than smaller fans, particularly at lower speeds.
Employ a fire safety feature that will deactivate the fan during a fire. In a public-private partnership Sustainable Sources converted the book into HTML in 1994. Green Building Professionals Directory Sustainable Building Sourcebook web version copyright Sustainable Sources 1994-2000.