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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.

If the fan doesn’t have a switch, connect the white wire from the ceiling to the white wire from the fan; connect the green wire to the ground wire; connect both black wires; and connect both blue wires. If yours has a switch, the white and green wires are connected the same way. However, connect the ceiling’s red wire to the light’s black wire and the ceiling’s black wire to the fan’s black wire. 

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.

No, a ceiling fan doesn’t have to be wired to a switch, but it’s often more convenient. You can use the included pull chain if your ceiling isn’t too high or install a remote module later, as they are a cheap, easy-to-install option that’ll let you control both the fan and light fixture.