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Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

It’s possible to install your own ceiling fans if you’re replacing an existing one. This work doesn’t require a permit and technically doesn’t necessitate a certified electrician, but it’s still a good idea to hire one. There’s always a safety risk when working with electrical components, even if you shut the power off at the breaker. If you’re installing a new ceiling fan where there currently isn’t a fixture, you will need a licensed electrician to run the new wiring and pull permits for the work.

The most efficient ceiling fan height is 8 to 9 feet from the floor to the fan blades. For ceilings higher than 9 feet, a downrod can be used to lower the fan to the optimal height. This positioning ensures adequate air circulation and maximizes the cooling effect. Remember, fans should be installed at least 7 feet above the floor for safety.

If you’re removing a ceiling fan without visible screws, start by locating the fan canopy—a round cover placed above the fan blades and motor. There should be a thin ring that can be turned counterclockwise to remove the canopy and reveal the screws. After unscrewing the fan, you can disconnect the wires and remove the entire fan from the mounting hardware. For safety, make sure the fan switch is turned off before you remove the canopy. It may be easier to remove the fan blades first, too.