How Does Air Conditioners Work To Cool The Room?

As you step into an AC room after a long hot day the cool air wraps around you and offers an instant relief, right? On scorching summer days, this cool air is not just a luxury — it is a necessity. An air conditioner becomes your best friend that makes you stay comfortable and sane when the heat outside feels unbearable.

You feel relaxed knowing your sit conditioner works well by protecting you from the sweltering temperatures. At the back of your mind, you might wonder how exactly it works to keep your space so cool. One common misconception is that air conditioners pull air from outside, but that is not true. Air conditioners do not pull air from outside; they recirculate and cool the indoor air.

Let us explore how air conditioners work to keep your room cool. But first, we need to know the basic principles of air conditioning.

Air conditioners do not pull air from outside!

Air conditioners do not pull air from outside. To clarify this, it is important to know heat transfer and the second law of thermodynamics before we understand how air conditioners work. Heat always moves from a hotter area to a cooler one. The air conditioner also uses this principle to cool your room by transferring heat from inside your home to the outside.

Now, let us discuss the refrigeration cycle, which plays an important role in air conditioning. Refrigerant is a special fluid that absorbs heat from indoor air and releases it outside. The refrigerant moves through a series of coils and components, constantly changing between liquid and gas states to keep the cooling process going.

Main Components of Air Conditioner

Air conditioner has some key components that work together to keep the environment cool.

1- Compressor: This is the most important part of the system. It pumps the refrigerant through the air conditioner and increases its pressure to prepare it to release heat.

2- Condenser Coils: These are located along with the AC outer. When the refrigerant flows through the condenser coils, it releases the heat absorbed from inside your house into the outdoor air.

3- Evaporator Coils: These are located near the air handler or furnace. The refrigerant flows through the evaporator coils, which absorb heat from the indoor air and cool it down.

4- Expansion Valve: The expansion valve controls refrigerant flow into the evaporator coils. It reduces the refrigerant’s pressure and allows it to cool down and absorb more heat.

5- Fans: The air conditioner has two fans. One blows indoor air over the evaporator coils to cool it, and the other blows outdoor air over the condenser coils to release heat.

How does the Refrigeration Cycle of Air Conditioning Work?

The refrigeration cycle is the core process that allows your air conditioner to cool your home. Here is a step-by-step process.

1- The cycle starts with the compressor, which compresses the refrigerant and increases its pressure and temperature. The refrigerant leaves the compressor as a hot, high-pressure gas.

2- The hot gas flows into the condenser coils outside your home. The refrigerant releases heat into the outside air and condenses into a high-pressure liquid. This removes heat from your home and expels it outside.

3- The high-pressure liquid refrigerant then passes through the expansion valve. This valve reduces the pressure of the refrigerant and allows it to expand and cool down. The refrigerant becomes a low-pressure cold liquid.

4- The cold liquid refrigerant flows into the evaporator coils inside your home. The refrigerant absorbs heat as the indoor air blows over these coils, causing it to evaporate into a low-pressure gas. This process cools the indoor air and circulates throughout your home.

How Does the Air Circulation Cycle Work within the Room?

Air conditioners do an excellent job of circulating and cooling the air inside your home. Here is how they work:

The air conditioner pulls warm air from your room into the unit through a return air duct. This warm air passes over the evaporator coils, where the refrigerant absorbs the heat by cooling the air. The cool air is then blown back into your room through supply ducts that create a cycle of air circulation. Air conditioners do not pull air from outside. Instead, they recirculate and cool the indoor air. The air conditioner maintains a comfortable temperature inside your home without introducing outside air by continuously cycling and cooling the same indoor air.

However, filters play an important role in maintaining air quality. It traps dust, pollen, and other particles from the air before it passes over the evaporator coils.

The Function of Thermostat in Regulating Temperature

The thermostat acts like the brain of the air conditioner. It has sensors that detect your room’s current temperature and humidity levels. You need to set the desired temperature on the thermostat, which constantly monitors the room’s temperature. When the rooms get warmer than the set temperature, the thermostat signals the air conditioner to turn on and start cooling.

Once the room reaches the desired temperature, the thermostat tells the air conditioner to turn off to maintain a consistent and comfortable climate.

Regular Maintenance is Important for Proper Air Conditioning

The cooling process of an air conditioning system is automatic, which makes it easy to stay comfortable. To keep your air conditioning running efficiently, you must perform regular maintenance.

Make sure to clean the evaporator and condenser coils regularly. Dust and dirt can build up on them, reducing cooling efficiency. Cleaning these coils regularly ensures proper heat exchange. Try to replace the air filters every one to three months to maintain good airflow and air quality.

Do not forget about the mechanical parts. Schedule a professional air conditioning technician to inspect and service your unit at least once a year. They can check for refrigerant levels, inspect the compressor, and ensure all components work correctly.

Syed Qasim

Syed Qasim ( CEO IQ Newswire ) Is a highly experienced SEO expert with over three years of experience. He is working as a contributor on many reputable blog sites, including,,,