Are there different types of speed controls for the fans. Is there a remote controller?
A. The most reliable type of controller for a whole house fan is a discrete two speed switch. These switches almost never fail, unlike electronic, variable speed controllers. Also, variable speed controllers can only be used on motors specifically designed for them. A variable speed motor used on the wrong type of motor will damage or destroy it and may create a safety hazard. No true whole house attic fan has a remote controller available for it at this time.