An air handling unit system refers to a unit used to re-condition and then circulate air throughout a given space, like a home or office building, as part of a heating, air-conditioning, and general ventilating system. This is sometimes referred to as an AC ventilation system or collectively as an HVAC system. The overall goal of these types of systems is to provide acceptable indoor air quality and general comfort. AC system design has changed a lot over the years, but the five basic parts remain the refrigerant, the compressor, the condenser coil, the expansion valve, and the evaporator coil.…