Many manufacturers suggest that house size is the primary determining factor for choosing the proper sized power unit. It is true that a larger house should have a larger power unit. A large house takes longer to clean, which means the vacuum will run for longer periods of time. A large motor is more heavy duty, and is better suited to continuous use than a smaller motor.

A family's lifestyle should play an important role in determining power unit size. Pets, kids, & lots of foot traffic can create big cleaning jobs, regardless of house size. Another important factor is the length of you time that you expect to live in your home. Selected Zenex models carry a limited lifetime warranty.