Heating, ventilation, and air conditioning HVAC is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer..There are various types of air conditioner systems. Choosing the right system depends on many factors that must be considered beforehand. An HVAC designer would consider all the related parameters and suggest the system most suitable for youre..Introduction to Commercial Building HVAC Systems and Energy Code Requirements Identify common HVAC system types. . Identify important HVAC controls, including.HVAC is an acronym that stands for “heating, ventilating and air conditioning.”. HVAC systems are used for climate control, particularly temperature and humidity levels. HVAC systems come in a broad range of sizes and complexity. The most commonly used types of HVAC systems are listed here..