Longer downrods, up to 72 in. You'll need a hugger mount that minimizes the distance between fan and ceiling for low-overhead spaces. It allows a fan to be hung from a flat or sloped ceiling, and helps keep the fan level when it's in use. Compare the fine print on guarantees. Some cover the entire fan, others just the motor.
Duration can range, too, from five years to lifetime coverage.
Standard controls for the fan motor and lights include a pull chain from the housing. For the ultimate in convenience, look for a remote control. Either wall-mounted or a wireless handheld unit, the device should control the lights and the fan speed. Some have a night-time mode for use in bedrooms, in which the speed is automatically slowed over time. Others include a security setting that trips the lights using random patterns that simulate an occupied house.