HVAC stands for Heating, Ventilation, and Air Conditioning. It refers to the mechanical systems used to regulate the temperature, humidity, and air quality inside buildings. These systems are essential for maintaining comfortable and healthy indoor environments in residential, commercial, and industrial spaces. 🔥 Heating System Provides warmth during cold seasons. Common types: Furnaces (gas or electric) Boilers Heat pumps ❄️ Cooling System Removes heat and moisture from indoor air. Common systems: Air conditioners (split or central) Chillers Evaporative coolers 🌬️ Ventilation System Ensures fresh air supply, removes stale or contaminated air. Can be: Natural (via windows, vents) Mechanical (fans, ducts, exhausts) Includes filters for air purification. 📈 Control System Thermostats, timers, sensors, and building management systems (BMS) that control temperature, humidity, and system operations.