Patent ID: 7784148

Claim:
A surface cleaning apparatus comprising: a housing including a base and an upright handle pivotally mounted to the base for manipulation of the base along a surface to be cleaned; a fluid delivery system mounted to the housing and including a fluid supply chamber for holding a supply of cleaning fluid and a fluid dispenser for applying cleaning fluid from the fluid supply chamber to the surface to be cleaned; a motor mounted within a passageway in the housing, the passageway having an inlet upstream of the motor and an outlet downstream of the motor; and a fan within the passageway for drawing cooling air through the inlet, for passing cooling air over the motor thereby heating the cooling air, and for exhausting the thus-heated cooling air from the outlet; wherein a section of the passageway downstream of the motor and upstream of the outlet is configured to pass the heated cooling air in heat exchange with the fluid supply chamber to heat the supply of cleaning fluid in the fluid supply chamber.