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9 Major Parts of Your Air Conditioner and Their Functions

An air conditioner is an essential appliance in many homes, especially during the hot summer months. However, many people don’t fully understand how their air conditioner works or what each part does. 

Understanding your air conditioner parts can help you troubleshoot issues, identify problems before they become major, and even prevent breakdowns. In this article, we’ll explore the different parts of your air conditioner and what they do.

1. Compressor

The compressor is the heart of your air conditioning system. It’s responsible for compressing the refrigerant gas and moving it through the system. The compressor is typically located outside your home and is powered by electricity.

2. Condenser Coil

The condenser coil is the part of your air conditioner that releases heat. It’s located outside your home and is responsible for transferring the heat from inside your home to the outside. The condenser coil is made up of several metal fins and tubes and is typically covered by a protective grille.

3. Evaporator Coil

The evaporator coil is responsible for absorbing heat from inside your home. It’s located inside your home, either in the attic or a closet, and is responsible for cooling the air that is circulated through your home. The evaporator coil is also made up of several metal fins and tubes and is typically covered by a protective grille.

4. Refrigerant Lines

The refrigerant lines are the tubes that carry the refrigerant gas between the compressor, condenser coil, and evaporator coil. The refrigerant lines are typically made of copper and are insulated to prevent heat loss.

5. Expansion Valve

The expansion valve is responsible for regulating the flow of refrigerant gas between the evaporator coil and the condenser coil. The expansion valve is located near the evaporator coil and is responsible for reducing the pressure of the refrigerant gas, which causes it to expand and cool the air that is circulated through your home.

6. Air Handler

The air handler is part of your air conditioner that circulates the cooled air through your home. It’s typically located in the attic or a closet and is responsible for blowing the cooled air through the ductwork and into your home.

7. Thermostat

The thermostat controls the temperature in your home. It’s typically located on a wall in your home and is responsible for turning the air conditioner on and off as needed to maintain the desired temperature.

8. Fan

The fan is responsible for blowing cool air into the room. It is located inside the air conditioner and draws warm air from the room over the evaporator coils. As the air passes over the coils, it is cooled and then blown back into the room.

9. Filter 

The filter is located in the air conditioner and is responsible for removing dust and other particles from the air. It is essential to keep the filter clean, as a dirty filter can reduce the efficiency of the air conditioner and affect the quality of the air.


Understanding your air conditioner’s parts is crucial to ensure its proper functioning and efficient performance. Each part plays a vital role in the cooling process, from the compressor and condenser to the evaporator and air filter. 

By knowing how these parts work and how they interact with each other, you can identify and diagnose any issues that may arise and take appropriate actions to maintain your air conditioner’s optimal performance. If you are unsure about the condition of your air conditioner, it is always best to consult a professional for advice.

Do you need AC maintenance in Brampton? At Furnace King, we offer a comprehensive AC maintenance service that includes inspecting and cleaning your system’s components, checking your refrigerant levels, and ensuring your ductwork is clean and clear. Contact us today to schedule an appointment with our experienced professionals and enjoy the benefits of a well-maintained air conditioning system!