Heating, Ventilation, and Air Conditioning (HVAC) plans are used to make and maintain systems of heating and air conditioning. As shown, HVAC plans are an essential part of building planning as it shows how water networks, boiler, and air ducts are installed in the building to make sure that the proper planning is done in the building. As per the image, a building zone HVAC plan has three core facts: installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ). While creating the HVAC plan for a building zone, the HVAC system is an essential subject to provide documented evidence about the accuracy of results produced by it.