A HVAC system works by controlling the temperature, humidity, and air quality of a space. It does this by circulating air through a network of ducts, using a combination of heating, cooling, and ventilation components. The system is typically powered by electricity, and includes a thermostat to monitor the temperature of the space and adjust the system accordingly. The system also includes a filter to remove dust and other airborne particles, as well as a humidifier to maintain the desired level of humidity. The system is designed to provide a comfortable environment for occupants, while also conserving energy and reducing energy costs.