Heating, Ventilation and Air Conditioning systems are commonly known by the abbreviation HVAC systems. As the name suggests, HVAC systems are used for maintaining indoor temperature in residential, commercial or industrial buildings and to maintain a certain level of air quality indoors. Three main components of any HVAC system are:
1.Heating – uses boiler or furnace to heat up water, air or steam as per requirement
2.Ventilation - uses fans or natural convection to maintain air flow in the building for temperature control, air quality control, filtering etc.
3.Air Conditioning - uses a refrigerant which is first compressed and then throttled to cool down the indoor air and then circulate the cold air to lower indoor temperature.