Bathrooms usually come with an exhaust fan to remove moisture from the buildup of steam. In addition to an exhaust fan, a bathroom may have a heater fan or a unit that combines a heater fan and a ceiling light. If your bathroom is cold or drafty, you may benefit from replacing an existing exhaust fan with a bathroom heater fan that includes a ceiling light.
Turn off the circuit to the bathroom from the breaker box. Remove the old exhaust fan from the ceiling. Remove the lightbulbs and the wiring cover from the old exhaust fan.