Package units are often used in condos, commercial buildings, multi-dwelling applications, and hotels. They are a good choice when there is little or no need for ductwork. These units have very basic functions and are usually factory-charged with refrigerant or tied into some kind of water circuit. Our service technicians do a great job maintaining these systems by cleaning the coils, lubricating the motor bearings, replacing or cleaning the air filters, replacing the drive belt (if used), tightening electrical connections, brushing the evaporator coil, testing refrigerant levels, water flow, and complete operation.