How Does An Air Conditioner Work?

Air conditioners have become an essential part of our lives, providing relief from the scorching heat during the summer months. But have you ever wondered how an air conditioner works? In this article, we’ll take a closer look at the inner workings of an air conditioner and explain the basic principles behind its cooling process. Find here useful tips for the best AC repair Dubai.

Refrigeration cycle:

At the heart of an air conditioner is a refrigeration cycle that allows it to cool the indoor air. The cycle involves the transfer of heat from inside the room to the outside environment. The refrigeration cycle consists of four main components: a compressor, a condenser, an expansion valve, and an evaporator.


Refrigerants are the substances responsible for absorbing and releasing heat during the cooling process. They have low boiling points, allowing them to change state from a gas to a liquid and vice versa at relatively low temperatures. Common refrigerants used in air conditioners include hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs).

Evaporator coil:

The cooling process begins at the evaporator coil, which is located inside the indoor unit of the air conditioner. The refrigerant enters the evaporator coil as a low-pressure, cool liquid. As the warm air from the room passes over the coil, the refrigerant absorbs the heat from the air and evaporates, transforming it into a low-pressure gas.


The gaseous refrigerant then enters the compressor, which is typically located in the outdoor unit of the air conditioner. The compressor plays a crucial role in the refrigeration cycle by compressing the low-pressure gas and raising its temperature and pressure. This process increases the energy of the refrigerant.

Condenser coil:

The high-pressure, high-temperature gas from the compressor enters the condenser coil, which is located in the outdoor unit. As the refrigerant flows through the condenser coil, it releases heat to the outdoor air. The refrigerant condenses back into a liquid state as it loses heat and releases the accumulated heat from the indoor air.

Expansion valve:

The condensed liquid refrigerant then passes through the expansion valve, which reduces its pressure and temperature. This sudden drop in pressure causes the refrigerant to expand and become a cool, low-pressure liquid.

Repeat process:

The cool liquid refrigerant then returns to the evaporator coil, where the cycle begins again. The process continues until the desired temperature in the room is reached.