What is the definition of a PTAC housing? PTAC stands for Packaged Terminal Air Conditioner, and it is a type of self-contained heating and cooling system that is typically installed through an exterior wall. A PTAC housing is the protective cover or casing that houses the internal system components. It is designed to be installed through a wall or window opening and is typically made from metal or plastic. The housing is designed to protect the system from external elements such as rain, snow, and debris. It also helps to insulate the system from temperature changes outside the building. Inside the housing are the necessary components such as the blower, fan, compressor, and heating and cooling coils. Depending on the model, some PTAC units also feature a humidifier and a dehumidifier. The housing also serves to protect the internal components from dust and other debris, which can reduce the effectiveness of the unit. PTAC housing is designed to be aesthetically pleasing and typically comes in a