The answer to 'how does HVAC system work' is that an HVAC (Heating, Ventilation, and Air Conditioning) system is responsible for regulating the temperature, humidity, and air quality within a building. It does this by using a series of components that work together to heat, cool, and circulate the air throughout the space.
The main components of an HVAC system include the furnace or boiler for heating, the air conditioner or heat pump for cooling, and the ductwork or vents that distribute the conditioned air. The system uses a refrigerant to absorb heat from the indoor air and release it outside, or vice versa, depending on whether heating or cooling is needed. Fans and blowers help to circulate the air, while filters and other components ensure the air is clean and healthy.