What is the definition of a MUA HVAC? MUA stands for Mechanical Unit Assembly, and HVAC stands for Heating, Ventilation and Air Conditioning. A MUA HVAC is an assembly of components that are used to provide heating, ventilation, and air conditioning for a residential, commercial or industrial space. This is typically a self-contained unit that includes the components necessary to provide these services. It includes items such as a motor, fan, compressor, evaporator, condenser, and ductwork. This assembly is designed to provide the proper temperature and air quality for a given space and typically operates off an electrical power source. The system also includes other components such as air filters, humidifiers, and air handlers. The MUA HVACHVAC system provides an efficient and cost-effective way to provide a comfortable environment for residential, commercial, or industrial locations. It is also a safe and reliable way to keep a space cool in hot climates and warm in