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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.

To determine if your ceiling box can support a fan, you must check if it is specifically fan-rated. Manufacturers are required to indicate this on the box itself. You may need to remove the existing light fixture to look inside the ceiling box for an inscription stating it is rated for fan use. If you do not see this confirmation, the box is likely not strong enough and must be replaced with a fan-rated junction box. For a proper and safe installation, you should also use a fan brace to secure the new box between the ceiling joists, which provides the necessary support for the fan's weight and motion.

Whether you can install a ceiling fan yourself depends on if you're replacing an existing fixture or installing one where no wiring exists. If you are replacing an existing fan, an experienced DIYer may be able to do the job, which can save on labor costs. This work typically doesn’t require a permit, but there’s always a safety risk when dealing with electrical components, so hiring a pro is still a good idea, especially if you aren't handy. Keep in mind you may need a special ladder for high or vaulted ceilings. However, if you are installing a new ceiling fan where there is no current fixture, you must hire a licensed electrician. In most areas, it is required by law that a professional runs new wiring and pulls the necessary permits. Attempting to install wiring yourself can be dangerous and a code violation.

If your home already has wires for a ceiling fan (and optional light kit), then it’s quite safe to wire and install it yourself. Always be very careful to shut off the power before you begin, and confirm that the power is safely off with a non-contact voltage tester before touching anything. It’s also highly recommended to use eye protection, rubberized gloves, and tools with rubber handles to keep yourself safe from electric shock.