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What Are the Parts of an Air Conditioner? A Professional HVAC Technician's Guide

parts of an air conditioner

Air conditioners are complex systems that ensure comfort in residential and commercial spaces. Understanding the components of an air conditioner can help you better maintain your system, identify issues, and communicate effectively with HVAC professionals. Here's a detailed breakdown of the essential parts of an air conditioner from a professional HVAC technician's perspective.


The compressor is often called the heart of the air conditioning system. It circulates refrigerant between the indoor and outdoor units, changing its state from gas to liquid and back, facilitating heat exchange.

Condenser Coil

Located in the outdoor unit, the condenser coil releases the heat removed from the indoor air into the outside environment. It works with the compressor and is essential for the cooling process.

Evaporator Coil

The evaporator coil is situated in the indoor unit and plays a pivotal role in cooling the air inside the space. It absorbs heat from the indoor air and circulates cool air throughout the environment.

Expansion Valve

Also known as the metering device, the expansion valve regulates refrigerant flow into the evaporator coil. It reduces the pressure of the refrigerant, enabling it to expand and cool before entering the evaporator coil.

Air Handler and Blower Motor

The air handler houses the evaporator coil and the blower motor. It is responsible for circulating air through the ductwork. The blower motor powers the fan that moves air across the evaporator coil, facilitating efficient heat exchange.


The air filter is a critical component that traps dust, pollen, and other airborne particles. It ensures indoor air quality and protects the HVAC system from dust buildup, which can reduce efficiency.


The thermostat is the control center of the air conditioning system. It allows you to set the desired temperature and controls the air conditioner's operation to maintain the set temperature.


Refrigerant is the lifeblood of the air conditioning system. It absorbs and releases heat as it circulates through the compressor, condenser, expansion valve, and evaporator coil.

What are Parts of an Air Conditioner?

Understanding the components of your air conditioner can enhance your ability to maintain and troubleshoot your system. Regular maintenance of these parts is essential to ensure the efficiency and longevity of your air conditioning system. For any concerns or maintenance needs, consult a professional HVAC technician like AC Texas to properly care for and operate your air conditioner.


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