HVAC stands for Heating, Ventilation, and Air Conditioning, and is a type of equipment used to provide thermal comfort and indoor air quality. It works by controlling the temperature, humidity, and air flow in a space, and is used in both residential and commercial buildings. HVAC systems can be used to heat, cool, ventilate, and dehumidify a space, making it comfortable for people to live and work in. HVAC systems can also be used to filter and purify the air, helping to reduce allergens and pollutants in the air. HVAC systems are designed to be energy efficient, and can help to reduce energy costs. In addition, HVAC systems can help to improve indoor air quality, reducing the risk of respiratory illnesses and other health problems. HVAC systems are an important part of any building, and can help to make a space comfortable and safe for people to live and work in.