MEP stands for Mechanical, Electrical, and Plumbing, and is a term used to describe the three engineering disciplines that are involved in the design and construction of buildings. HVAC stands for Heating, Ventilation, and Air Conditioning, and is a system used to provide thermal comfort and indoor air quality. HVAC systems are typically designed and installed by MEP engineers, and are responsible for controlling the temperature, humidity, and air quality of a building. HVAC systems are essential for providing a comfortable and safe environment for occupants.