Get matched with top ceiling fan pros in Berkeley Heights, NJ

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.

A typical fan installation takes between two and six hours. The exact timeframe can be influenced by factors such as the home's structure, existing electrical characteristics, ease of attic access, and whether complex wiring or additional attic ventilation work is required.

Installing a ceiling fan where no wiring exists is a difficult and potentially dangerous job that should not be attempted as a DIY project. It is recommended to hire a certified electrician to build the necessary electrical infrastructure. In some areas, building codes require this work to be done by a professional to ensure safety and compliance. Due to the complexity, this type of installation is a significant job that could cost up to $2,000.

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.