Most people are aware of the concept of heaters as heating units. Who doesn’t warm up their room during the winters with a convector heater? Now, imagine a system that centrally heats an entire building. That is what the heating aspect of HVAC systems is about. A heating unit like a boiler or a heat pump heats water or air in a furnace or a large mechanical room. The process of conduction or convection transfers heat from this heating unit of the HVAC systems to all the areas of the building. Pipes transport heat created by water or steam in the heating unit to other areas. A circulator or a heat pump in the heating unit moves the hot water to distribution systems. Wall-mounted or floor-installed radiators transfer heat throughout the building. The transfer of heat using steam or water is known as Hydronics. The heat from the air is transferred through ducts that are heat-resistant. In this system, the air needs to be filtered for dust and other particles.