Air Conditioner Not Cooling? Troubleshooting Guide and Solutions

If you’re facing the problem of your air conditioner not cooling your home, you’re not alone. Many factors can cause this issue, and it’s essential to identify the root cause. Here are common reasons why your AC might not be cooling as it should:

  • Incorrect Thermostat Setting
  • Dirty Air Filter
  • Clogged Condenser
  • Blocked Vents or Air Ducts
  • Faulty AC Fan Motor
  • Refrigerant Leak
  • Bad Compressor
  • Improper Installation and Leaky Air Ducts
  • Dirty Evaporator Coils

let’s explore how to address these problems and restore your AC to cooling your home efficiently at

Simple DIY Fixes for an AC Not Cooling

Incorrect Thermostat Setting:

Common Issue: Sometimes, your thermostat may be set to ‘Fan’ mode, causing the fan to run continuously without cooling your home.

Solution: Set the thermostat to ‘Auto’ mode and ensure the desired temperature is correctly adjusted.

Dirty Air Filter:

Common Issue: A dirty air filter can restrict the airflow and affect cooling.

Solution: Check and clean or replace the air filter regularly to maintain proper airflow.

Clogged Condenser:

Common Issue: A dirty outdoor condenser filled with debris can hinder cooling.

Solution: Use a water hose to clean the condenser, but be gentle to avoid damage.

Blocked Vents or Air Ducts:

Common Issue: Closing air vents in unused rooms can restrict airflow and make your AC work harder.

Solution: Open all available vents and air ducts to allow proper airflow.

Faulty AC Fan Motor:

Common Issue: If the fan outside your home doesn’t turn on or off correctly, it may be clogged or worn out.

Solution: Check for tripped breakers, clean or replace filters, and ensure the fan blades are not obstructed. For persistent issues, consult a professional HVAC technician.

Refrigerant Leak:

Common Issue: Low refrigerant levels due to leaks can result in inadequate cooling.

Solution: Contact a professional HVAC contractor to identify and fix the leak or replace damaged coils.

Bad Compressor:

Common Issue: The compressor responsible for cooling can fail for various reasons.

Solution: Complex compressor issues may require professional repair or replacement. Regular AC maintenance can help prolong its life.

Improper Installation and Leaky Air Ducts:

Common Issue: Incorrect installation or leaky air ducts can lead to inefficient cooling.

Solution: Check for tears in ducts and ensure a proper seal in duct joints. If needed, consult a licensed HVAC contractor for assistance.

Dirty Evaporator Coils:

Common Issue: Dirty evaporator coils can hamper the cooling process.

Solution: Cleaning the coils is best left to a licensed HVAC technician, typically during annual maintenance.

When to Seek Professional Help

If your DIY efforts don’t resolve the issue, it’s time to consider professional assistance. An HVAC technician can diagnose and fix more complex problems with your air conditioner.


Please don’t suffer in a warm house when your air conditioner isn’t cooling. Following these troubleshooting steps and knowing when to seek professional help, you can ensure your home stays relaxed and comfortable throughout the hot months.

Frequently Asked Questions

Q: Why Is My AC Running But Not Cooling?

A: If your AC is running but not cooling, it could be due to a thermostat issue, a blocked or dirty condenser, compressor problems, or refrigerant leaks.

Q: How Do I Fix My AC Not Blowing Cold Air?

A: You can clean the air filter and evaporator coils and run the fan only when there’s no ice. For more complex issues, consult a professional HVAC technician.

Q: Should I Turn Off the AC If It’s Not Cooling?

A: It’s a good idea to turn off the air conditioner if it’s not cooling correctly, especially if the unit may be frozen, as running it in this condition can damage the compressor.

For professional AC repair and maintenance services in Singapore, contact SoCool. Keep your home cool and comfortable all year round.

Experience Cool Comfort with SoCool in Singapore!

If you’re facing AC problems, don’t hesitate to contact expert air conditioner repair and maintenance services. Our experienced technicians will ensure your home stays relaxed and comfortable. Contact us today!

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