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The direction your ceiling fan spins helps create comfortable airflow in your home and can also help cut down on energy costs. 

During summer, your ceiling fan should spin counterclockwise. This will push cooler air downward in a column and help lower your room’s air temperature. In the winter, set your ceiling fan to spin clockwise and at the lowest speed setting. This will pull cool air upwards, displacing the warm air that pools towards the top of your ceiling and bringing it down towards the floor.

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.

Yes, you can install a ceiling fan where a standard light fixture is, as the electrical wiring is often similar and may not need to be replaced. The most important step is to ensure the ceiling can support the fan's weight and motion. You will need to replace the existing light fixture's electrical box with a fan-rated electrical box, which is specifically designed to handle the extra weight and vibration. These boxes will be labeled as suitable for ceiling fan support and will indicate the maximum weight they can hold. Before you begin, also consider if you need an extension rod for a high ceiling or a special mount for an angled ceiling.

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.