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COMFORT INSIDE (HVAC) INTRODUCTION HVAC stands for Heating, Ventilation, and Air Conditioning. This system makes the air inside a building comfortable. It controls the temperature and the air quality. Heating In cold weather, we need to heat the building. There are different ways to do this. One common way is central heating. A boiler heats water. The boiler can use gas, oil, or electricity. Pumps send the hot water through pipes to radiators in each room. The radiators get hot and warm the air