The answer to 'what does HVAC system do' is an HVAC (Heating, Ventilation, and Air Conditioning) system is responsible for regulating the temperature, humidity, and air quality within a building. It works to keep the indoor environment comfortable and healthy for the occupants.
HVAC systems use a combination of equipment, including furnaces, air conditioners, heat pumps, and ventilation ductwork, to heat, cool, and circulate the air. They also help control the humidity levels, filter out pollutants, and provide fresh outdoor air to the indoor spaces. HVAC systems are essential for maintaining a comfortable and energy-efficient living or working environment throughout the year.