How to Clean Coils on AC Unit Inside

How to Clean Coils on AC Unit Inside: A Comprehensive Guide


In the scorching heat of summer, your air conditioning unit becomes your best friend, ensuring you stay relaxed and comfortable indoors. However, regular maintenance is crucial to keep your AC functioning efficiently. One essential aspect of AC maintenance is cleaning the coils, particularly those inside the unit. In this guide, we’ll walk you through the steps to effectively clean the coils on your AC unit, helping you ensure optimal performance and prolong its lifespan.

Understanding the Importance of Clean Coils

H1: Why Clean Coils Matter

Dirty coils can significantly reduce the efficiency of your air conditioning unit, leading to higher energy bills and potential damage to the system.

H2: Impact on Energy Efficiency

When coils are covered in dust, dirt, or debris, they can’t effectively transfer heat. This forces the system to work harder to cool your home, consuming more energy.

H2: Prevention of System Breakdowns

Regular coil cleaning prevents the buildup of grime that can cause corrosion or blockages, potentially leading to costly repairs or system failures.

Signs That Your Coils Need Cleaning

H1: Reduced Cooling Performance

If your AC isn’t cooling your home as effectively as it used to, dirty coils could be the culprit.

H2: Increased Energy Bills

A sudden spike in your energy bills without a corresponding increase in usage could indicate that your AC is working harder due to dirty coils.

H2: Ice Formation on Coils

Ice buildup on the coils is a clear sign of restricted airflow, often caused by dirt and debris accumulation.

How to Clean Coils on AC Unit Inside

H1: Safety Precautions

Before you begin, ensure the power to your AC unit is turned off to prevent any accidents. Additionally, wear gloves and protective eyewear to shield yourself from cleaning chemicals and debris.

H1: Gather the Necessary Tools

You’ll need a soft brush, a vacuum cleaner with a soft brush attachment, a fin comb, a coil cleaner solution, and a spray bottle.

H1: Access the Coils

Depending on your AC unit’s design, you may need to remove a panel or access cover to reach the coils. Refer to your manufacturer’s instructions for guidance.

H1: Brush Away Surface Debris

Using the soft brush, gently remove any visible dust or debris from the coils. Be careful not to bend the delicate fins.

H1: Vacuum the Coils

Using the vacuum cleaner with the soft brush attachment, carefully vacuum the coils to remove finer particles and debris.

H1: Apply Coil Cleaner

Dilute the coil cleaner solution per the manufacturer’s instructions and spray it onto the coils. Allow it to sit for a few minutes to loosen stubborn dirt and grime.

H1: Rinse the Coils

Rinse the coils thoroughly to remove the cleaner and dislodged dirt using a spray bottle filled with water.

H1: Straighten Bent Fins

If you notice any bent fins during the cleaning process, use a fin comb to gently straighten them out, ensuring optimal airflow.

H1: Allow the Coils to Dry

Once cleaned, allow the coils to air dry before restoring power to the AC unit.


Regular maintenance, including cleaning the coils inside your AC unit, is essential for ensuring efficient operation and prolonging its lifespan. By following the steps outlined in this guide, you can keep your AC running smoothly, save energy, and avoid costly repairs.

FAQs (Frequently Asked Questions)

Q1: How often should I clean the coils on my AC unit?

A1: The coils should be cleaned at least once a year, preferably before the start of the cooling season.

Q2: Can I use household cleaners to clean the coils?

A2: To avoid damaging the coils or other components, it’s best to use coil cleaner solutions specifically designed for AC systems.

Q3: What if I notice mold or mildew on the coils?

A3: If mold or mildew is present, use a solution of water and mild detergent to clean the coils thoroughly. Rinse well and allow to dry completely.

Q4: Can I clean the coils or hire a professional?

A4: While cleaning the coils is a DIY task, hiring a professional HVAC technician is always best if you need clarification or are uncomfortable with the process.

Q5: Will cleaning the coils improve my AC’s cooling performance?

A5: Clean coils allow for better heat transfer, resulting in improved cooling performance and energy efficiency.