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Demystifying AC Coils: Understanding Their Role in Cooling Systems

Image of Amanda Triolo - CEO of Grasshopper
Amanda Triolo, CEO of Grasshopper Heating & Cooling
Published July 31, 2024
Demystifying AC Coils: Understanding Their Role in Cooling Systems

When your AC’s cooling performance declines, there’s a good chance the problems originated with the AC coils. There are two coils: the evaporator coil and the condenser coil. They get a lot of wear and tear.

Grasshopper Heating & Cooling put together the following information to explain the importance of understanding the role of AC coils. Once you understand what they do, you see that caring for them properly keeps you cool and your AC functioning.

How AC Coils Keep Your Home Cool

The AC coils make the refrigerant cycle possible, so when there’s no AC coil function, there’s no cool air.

How the Evaporator Coil Helps Cool Your Home

There’s no such thing as an AC simply blowing cold air. The cool air comes from the air conditioner removing hot air via heat exchange. 

The blower fan sends hot, moist air to the evaporator coil. The coil contains refrigerant. When muggy air passes over it:

  1. The refrigerant cools the air.
  2. The cool air flows back into the house.
  3. The refrigerant vaporizes.

Next, the vaporized refrigerant floats toward the condenser coil outside.

How the Condenser Coil Helps Cool Your Home

Once the vapor exits the house, it floats over the compressor on its way to the condenser coil. The compressor spikes the vapor’s temperature. Then the outer unit’s fan sends air over the condenser coil.

This process expels heat into the air. The condenser coil liquifies the refrigerant, signifying that it’s cooled. The refrigerant shoots back to the evaporator coil. 

And then it starts all over. When it works, you enjoy fresh air. When something goes wrong, the house fills with hot, stale air quickly.

Air Conditioning Maintenance Elevates HVAC System Efficiency

Understanding the role of AC coils means you can’t put off getting regular maintenance services to keep the coils in prime performance mode. These services keep your energy bills low and optimize the system. 

During maintenance, a professional contractor will look for corrosion on the evaporator coil. They will clear debris clogging the outer unit, getting rid of twigs and leaves. They will also refill the refrigerant if necessary. 

Professionals go through the system step-by-step to ensure your AC blows quality air.

Signs of a Damaged Evaporator Coil 

You may have a malfunctioning evaporator coil if you notice: 

  • Refrigerant leaks
  • Ice on the outside of the unit
  • An inaccurate thermostat reading 

Signs of a Damaged Condensor Coil 

A damaged condenser coil often produces these symptoms:

  • Loud noises coming from the unit
  • The unit cycling on and off
  • Inadequate cooling throughout the house

Maintenance and speedy repairs heighten AC performance and extend longevity. 

Contact Grasshopper Heating & Cooling for HVAC Maintenance and Coil Repairs

Understanding the role of AC coils makes it easier to understand why timely maintenance and repairs matter.

Grasshopper Heating & Cooling provides HVAC maintenance to ensure your AC coils produce cool air. We also do other HVAC repairs and installations. Call 518-241-5734 to stay cool or get cool soon.


Image of Amanda Triolo - CEO of Grasshopper
Amanda Triolo
Amanda Triolo is the CEO of Grasshopper Heating & Cooling, a rapidly growing HVAC company based in Albany, New York. She leads by focusing on creating opportunities that positively impact both employees and customers.

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