The indoor unit's blower fan pumps the cooled air back into the home. The filtered indoor air passes over the cold evaporator coil, converting the liquid inside the coil into gas. The air passes through filters, where lint, dust, debris, and other airborne particles are collected. The indoor unit's fan pulls hot air from the inside of the house through the return ducts. It signals the air conditioning system both inside and outside to start running. The cooling process begins when the thermostat determines that the temperature needs to be lowered. The thermostat monitors and controls the indoor air temperature. This results in a continuous cycle of heat and humidity leaving the indoor air, cool air coming back into the home, with heat and humidity exiting. The fan pulls in the outdoor air and rejects the heat absorbed from the home. As the refrigerant turns back into a liquid, warm air is released outside. In the outdoor unit, the refrigerant gas is compressed before it enters the coil. The cooled air is distributed into the house through the ductwork. The heat from the indoor air absorbs into the refrigerant returns to gas form from liquid. Warm indoor air blows across a cold coil full of refrigerant. In basic terms, air conditioning involves two simultaneous actions - one inside the home and one outside the home. Central air conditioning refers to a comprehensive system that features several components:Ī thermostat for controlling system operation: It signals central AC systems to cycle on and off once the home reaches a set temperature.Īn outdoor unit that features a condenser coil, fan, and a compressorĪn indoor unit that features an evaporator coil and a blower fan (air handler) to circulate the cooled airĪ network of copper tubing that enables refrigerant to flow freely between the indoor and outdoor unitsĪn expansion valve to regulate the amount of refrigerant that flows through the evaporator coilĭuctwork throughout the home allows the air to circulate from the indoor unit to all the living space areas and back into the indoor unit.
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