What are the components of house aircon?

What are the things on the side of an air conditioner called?

What are the Components of a House Air Conditioner?

When it comes to maintaining a comfortable indoor environment, especially during hot summer months, a reliable air conditioning system is essential. Understanding the components that make up a house air conditioner can help homeowners better comprehend how this intricate system works and enable them to identify and address any potential issues. In this article, we will explore the various components of a typical house air conditioner and their functions. What are the components of house aircon?

1. Compressor

The compressor is a crucial component of any air conditioning system. It is often referred to as the “heart” of the system since it plays a vital role in the cooling process. The compressor’s primary function is to circulate refrigerant throughout the air conditioning system, transferring heat from the indoor environment to the outdoor unit.

Inside the compressor, the refrigerant gas is compressed, increasing its pressure and temperature. This high-pressure gas is then pumped into the condenser coil, where it releases heat to the surrounding air, resulting in the refrigerant transforming into a high-pressure liquid.

2. Condenser Coil

The condenser coil is located in the outdoor unit of the air conditioner. Its main purpose is to dissipate heat by allowing the refrigerant to release heat energy to the surrounding environment. The condenser coil consists of numerous thin metal fins that increase the surface area for efficient heat transfer.

As the high-pressure refrigerant enters the condenser coil, it loses heat and starts to condense into a liquid. The heat energy is released to the outdoor air, and the refrigerant, now in liquid form, continues its journey to the next component in the system.

What are the components of house aircon?
What are the components of house aircon?

3. Evaporator Coil

The evaporator coil is located in the indoor unit of the air conditioner, often connected to the furnace or air handler. Its primary function is to absorb heat from the indoor environment, cooling the air and improving indoor comfort.

When the refrigerant, in liquid form, enters the evaporator coil, it undergoes a rapid expansion, causing a drop in pressure. As a result, the refrigerant evaporates into a gas and absorbs heat from the surrounding air. The cooled air is then distributed throughout the house via the air ducts.

4. Expansion Valve

The expansion valve is a small but critical component of the air conditioning system. Its primary function is to regulate the flow of refrigerant from the high-pressure side to the low-pressure side of the system. It accomplishes this by controlling the amount of refrigerant that enters the evaporator coil.

As the high-pressure liquid refrigerant passes through the expansion valve, it undergoes a pressure drop, causing it to expand rapidly and transform into a low-pressure gas. This low-pressure gas enters the evaporator coil, where it absorbs heat from the indoor air, repeating the cooling cycle.

5. Air Handler

The air handler, also known as the blower unit, is responsible for circulating conditioned air throughout the house. It consists of a fan that draws air from the return ducts, passes it over the evaporator coil for cooling, and then distributes it through the supply ducts to different rooms in the house.

The air handler also contains filters that trap dust, pollen, and other airborne particles, improving indoor air quality. It may include additional components like a motor, control board, and other electrical connections to facilitate proper operation.

6. Thermostat

The thermostat acts as the control center of the air conditioning system.

The thermostat acts as the control center of the air conditioning system. It allows homeowners to set and adjust the desired temperature in their homes. The thermostat senses the temperature of the room and sends signals to the air conditioner to turn on or off accordingly.

side of an air conditioner called

Modern thermostats are often programmable, enabling users to set temperature schedules based on their daily routines. This feature allows for energy efficiency by automatically adjusting the temperature when occupants are away from home or asleep.

7. Air Ducts

Air ducts are an integral part of a central air conditioning system. They are responsible for distributing cooled air from the air handler to different rooms in the house. The ductwork is typically made of sheet metal or flexible material and is designed to deliver air efficiently and evenly throughout the space.

Properly insulated air ducts prevent air leakage and ensure that cooled air reaches its intended destinations without unnecessary energy loss. Regular maintenance and cleaning of air ducts are essential to maintain good indoor air quality and system efficiency. For air con parts see here.

8. Refrigerant

Refrigerant is the substance responsible for absorbing and releasing heat to facilitate the cooling process in an air conditioning system. It circulates through the various components, changing from a gas to a liquid and back again. The most commonly used refrigerants today are hydrofluorocarbons (HFCs) due to their lower environmental impact compared to older refrigerants like chlorofluorocarbons (CFCs).

It’s important to note that handling and servicing refrigerant should be left to trained professionals as it requires specialized knowledge and equipment to ensure safe and proper operation of the air conditioning system.


Understanding the components of a house air conditioner is essential for homeowners to maintain their cooling systems properly. The compressor, condenser coil, evaporator coil, expansion valve, air handler, thermostat, air ducts, and refrigerant all play critical roles in the cooling process. Regular maintenance, such as cleaning or replacing filters, checking refrigerant levels, and inspecting the overall system, can help ensure optimal performance and energy efficiency.

By familiarizing themselves with these components and their functions, homeowners can better communicate with HVAC professionals, troubleshoot potential issues, and make informed decisions regarding their air conditioning systems. A well-maintained and properly functioning air conditioner not only provides comfort but also contributes to a healthier and more enjoyable indoor environment during hot summer months.

Disclaimer: It is always recommended to consult a qualified HVAC professional for any installation, maintenance, or repair work related to your air conditioning system.

Leave a comment

Your email address will not be published. Required fields are marked *