A ceiling fan improves comfort year-round and can cut cooling costs. Installation is a moderate DIY job, but it hinges on one safety-critical detail: the box that supports it.
Use a fan-rated box
A ceiling fan moves and is heavy, so it must hang from a fan-rated electrical box marked for that weight and motion — not a standard light box, which can pull loose and drop the fan. Fan-rated boxes are typically marked for up to about 70 lb; a heavier fan needs separate structural support. If you're replacing a light, you may need to upgrade the box first.
Power off and wire
Turn off the breaker and verify the wires are dead. Assemble the fan, hang the bracket, and connect the wiring — typically black to black, white to white, ground to ground, and a separate wire for a light kit. Follow the fan's diagram, especially with separate wall switches.
Balance and test
Secure the fan, attach the blades, and restore power. If it wobbles, a balancing kit (small weights on the blades) smooths it out. Set the direction switch — downward airflow in summer, gentle upward in winter.