What Are the 4 Main Parts of an AC?

Your AC unit plays a pivotal role in maintaining your home comfortable during the scorching summer months. While you may know that your air conditioner unit is responsible for cooling the air, you might not know the intricate components that make it all work seamlessly.

In this blog post, brought to you by B & G Heating Air Conditioning & Ventilation, we’ll delve into the four main parts of an AC system and explain why understanding them is crucial for maintaining a comfortable indoor environment. Whether you require AC repair in Burlington, this information will help you make informed decisions for your HVAC needs.

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The Compressor


The compressor is widely regarded as the central component of your air conditioning system, serving as its heart. Its crucial function in the cooling process involves compressing the refrigerant gas, which is responsible for absorbing and releasing heat. Let’s delve into how this vital process works:

1. The compressor takes in low-pressure, low-temperature refrigerant gas.

2. It compresses this gas, causing it to become high-pressure and high-temperature.

3. The hot, pressurized gas is sent to the condenser coil outside your home.

The role of the compressor is vital as it guarantees that the refrigerant is adequately prepared to efficiently release heat in the subsequent phases of the cooling process.

The Condenser Coil


The condenser coil, located in your AC system’s outer unit, dissipates heat. When the hot, high-pressure refrigerant gas from the compressor enters the condenser coil, it loses heat. Here’s what happens next:

1. The refrigerant gas cools down and condenses into a liquid.
2. As it releases heat, a fan blows outdoor air over the coil to expedite the cooling process.
3. The now-liquid refrigerant moves to the expansion valve, preparing for the next stage.

Having a clear understanding of the condenser coil’s role is vital as it directly affects the efficiency of your air conditioning system. By correctly maintaining this component, you can ensure optimal performance and longevity for your unit.

The Evaporator Coil


The evaporator coil is the indoor counterpart to the condenser coil in your HVAC system’s air handler or furnace. Its major function is to absorb heat from your home’s indoor air and send cool air back into your living spaces. Here’s how it works:

1. The refrigerant, which is in liquid form, enters the evaporator coil after passing through the expansion valve from the condenser coil.
2. The refrigerant absorbs heat as indoor air is blown over the coil, causing it to evaporate into a gas once again.
3. The heat-absorbed refrigerant is then returned to the compressor to restart the cooling cycle.

The evaporator coil is essential because its efficiency directly impacts your home’s comfort. A clean and well-maintained evaporator coil ensures efficient cooling and better indoor air quality.

The Expansion Valve


The expansion valve is a vital component that regulates refrigerant flow between the evaporator and condenser coils. Its primary function is to reduce the pressure and temperature of the refrigerant as it moves from the high-pressure side (condenser) to the low-pressure side (evaporator). Here’s how it works:

1. The liquid refrigerant, which is under high pressure, enters the expansion valve from the condenser.
2. As it passes through the valve, its pressure and temperature drop significantly.
3. The low-pressure refrigerant can enter the evaporator coil to absorb indoor heat.

The expansion valve’s role in the cooling cycle is crucial because it ensures the refrigerant is in the right state to efficiently absorb heat in the evaporator coil. This component helps maintain the balance in your AC system.

Maintaining Your AC System for Optimal Performance

Now that you have a solid grasp of the four primary components of an air conditioning system, you are better equipped to make well-informed decisions regarding your HVAC requirements. If you reside in Hamilton, ON, and require AC service, keep these key points in mind:

1. Regular maintenance is vital to ensure optimal efficiency and performance of your AC system. It is recommended to schedule annual tune-ups with a professional to ensure all components are in optimal condition.

2. If you encounter any issues with your air conditioner, do not hesitate to seek professional assistance. Ignoring problems can result in more extensive and costly repairs in the future.

3. Understanding the various components of your AC system allows for effective communication with our professionals, facilitating faster and more accurate diagnosis and repairs.

Do not allow the summer heat to overpower you. Take charge of your indoor comfort by comprehending the key elements of your AC system and investing in its maintenance and care.


Call Us Now to Schedule Your Air Conditioning Needs

At B & G Heating Air Conditioning & Ventilation, we’re dedicated to providing expert HVAC services to keep you comfortable all year round. Our team protects you whether you need AC replacement or maintenance in Burlington, ON. Contact us now to schedule your appointment and experience the difference of working with a trusted company. Stay comfortable with our expertise.