AC Not Cooling? Discover 9 Expert Solutions That Work

Is your air conditioner still not cooling down after running for hours? We understand that nothing is worse than having a broken air conditioner in the summer. A bad air conditioner can make your home feel like a sauna, no matter if you live in a busy city like Kolkata or a quiet rural town.

The good news is? Most cooling problems can be fixed, and some don’t even require a technician!

In this guide, we’ll cover the nine most common reasons why your AC not cooling and give you practical tips on how to make your home cool and comfortable again.

1. Clogged or Dirty Air Filter

Why it happens:

The air filter in your AC catches dust, pet hair, pollen, and other particles in the air. It gets clogged over time and stops air from flowing. This makes it harder for the AC to move cool air around, which lowers its overall efficiency.

How to indicate that:

• Airflow from vents that are weak or uneven
• More dust inside
• Allergies or sneezing when the AC is on. 
• The AC takes a lot longer to cool the room.

How to fix it:

• Before checking the filter, turn off your air conditioner.
• If the filter can be used again, wash it with mild soap and water.
• Before putting it back together, let it dry all the way.
• For filters that can be thrown away, use one that works with it.

Maintenance Tip:

Clean or change the air filter every 2 to 4 weeks during the summer when you use it a lot. It’s the easiest and most common fix for problems with cooling.

2. Low Refrigerant or Gas Leakage

Why it happens:

The cooling liquid that takes in heat from inside your room and releases it outdoors is called refrigerant, which is also known as R-22 or R-410A. The air conditioner may run but not efficiently cool if the levels are low or there is a leak.

How to indicate that:

• The indoor unit’s warm air
• The formation of ice on copper coils or pipes
• Strange bubbling or hissing sounds
• Higher electricity costs as a result of the AC running longer

How to fix it: 

• Avoid attempting to fill up the gas tank on your own.
• Speak with a licensed HVAC professional to:
  • Find and stop leaks.
  • Use the appropriate kind of refrigerant to replenish the system.
  • Examine system performance and test pressure.

Important:

Using a low-gas air conditioner can harm the compressor, which is far more costly to fix.

3. Incorrect Thermostat or Remote Settings

Why it happens:

While this may seem simple, the cause is frequently incorrectly configured thermostats or remote controls.

How to indicate that:

• If the air conditioner is in “Fan” or “Dry” mode rather than “Cool”
• Too high of a thermostat setting (for example, 28°C or higher)
• The remote control is not sending the signal correctly.
• Remote batteries that are weak or dead

How to fix it: 

• Select “Cool” as the mode.
• Set the temperature between 22 and 24°C.
• Change the batteries in the remote control.
• To reset settings, restart the air conditioner.

Expert Advice:

If your air conditioner has a programmable thermostat, set it to save energy when you’re away and maintain maximum comfort when you’re at home.

Read More: In 2025 How to Access Voltas AC Remote Hidden Features for Boost Cooling Perfomance

4. Dirty or Blocked Outdoor Unit (Condenser)

Why it happens:

Your outdoor unit of AC discharges heat gained from inside. If it is obstructed by leaves, dirt, or other things, it cannot release heat effectively—resulting in inferior cooling.

How to indicate that:

• AC running all the time but the room remains hot
• Hot air blowing from the outdoor unit
• Dirt or blockage seen on or around the unit
• Fan not rotating effectively

How to fix it: 

• Switch off the power supply
• Clean with a soft brush or a vacuum to clear dust
• Gently spray water on the unit’s fins (do not use high pressure)
• Keep 2–3 feet around the unit clear for effective airflow

Maintenance Tip:

Clean the outdoor unit twice a year—particularly before summer and after monsoon.

5. Electrical or Wiring Issues

Why it happens:

Capacitors, relays, sensors, and wires are some of the electrical parts that ACs depend on. Any issue with them could cause the machine to shut down or fail to cool.

How to indicate that:

• The AC doesn’t turn on at all.
• The inside unit operates while the outdoor unit does not start.
• Fuses don’t stop tripping.
• Buzzing sounds or a burning smell

How to fix it:

• Check your circuit breaker panel for tripped breakers
• If fuses blow frequently, don’t turn the air conditioner back on.
• Speak with a certified AC or electrical technician.

Safety Tip:

Electrical problems are risky. Avoid doing repairs yourself unless you are skilled.

6. Frozen Evaporator Coils

Why it happens:

• Typically, frozen coils are caused by:
• Filters that are clogged
• Ducts that are blocked
• Low levels of refrigerant
• Long hours of AC use at very low temperatures

How to indicate that:

• Ice gathering near vents or on the indoor unit
• The air conditioner stops cooling and starts to leak water.
• Diminished airflow

How to fix it:

• Switch off the air conditioner and allow the ice to melt fully.
• Clean the air filters.
• After two to three hours, restart the air conditioner.
• Call a technician to check the airflow and refrigerant if the issue persists.

7. Compressor Malfunction

Why it happens:

The compressor promotes heat exchange and circulates the refrigerant, making it the most important component of the air conditioning system. If it fails, the AC won’t cool.

How to indicate that:

• AC running but no cold air
• loud humming sound
• The outside unit is not starting.
• Frequently occurring power cycling

How to fix it:

• Expert diagnosis is required for compressor troubles.
• Repair or replacement based on warranty and damage
• Ask for authentic parts whenever a replacement is required.

Cost Tips:

The cost of replacing a compressor is high. Inquire as to whether the warranty covers it.

8. Incorrect AC Size for the Room

Why it happens:

Larger rooms are difficult for an undersized air conditioner to cool. The room feels damp because oversized air conditioners cool too quickly and turn off before removing humidity.

How to indicate that:

• The temperature in the room never reaches what is expected.
• AC runs constantly with no impact.
• Disparate dampness or cooling

How to fix it:

• Choose the appropriate tonnage:
  • Rooms up to 120 square feet, 0.8 to 1 ton.
  • Rooms up to 180 square feet, 1.5 tons.
  • 2 Ton: Bigger spaces or hallways

• Install more cooling or swap it out for a unit of the right size.

Click Now: Calculte the best AC Size for Your Room

9. Skipping Regular Maintenance

Why it happens:

Wear and tear, dust accumulation, clogged coils, and decreased efficiency are caused by unscheduled maintenance.

How to indicate that:

• Progressive cooling power loss
• Strange sounds
• Increased use of electricity
• Vents with a bad smell

How to fix it:

• Schedule a comprehensive AC inspection every six months.
• Make sure the service consists of:
  • Cleaning of the coil and filter
  • Check the gas pressure.
  • Calibration of the thermostat
  • Examining the electrical system

Pro Tip:

For same-day AC service in Kolkata, use reputable companies like Quick2Service, which have skilled experts and authentic spare parts.

When to Call a Professional if AC not cooling

If your air conditioner is still not cooling after doing simple repairs, you need to get help from a professional. You will need professional help with:

• Checking for gas recharge and leaks
• Issues with the motor or compressor
• Electrical system repairs
• Upgrades or replacements to the system

Quick2Service offers:

• Certified technicians in the area
• Open and transparent pricing
• Service availability on the same day
• service for all of the major brands, including Voltas, Samsung, LG, and Daikin.

Conclusion

Anon-cooling AC doesn’t always mean an expensive form. From dirty air sludge to low refrigerant, numerous issues can be fluently diagnosed and fixed. 

Quick Recap 

•  Clean air pollutants and out-of-door unit 
•  Check thermostat settings 
•  Look out for signs of gas leaks, firmed coils, or wiring issues 
•  Book regular conservation to avoid breakdowns 

Still, your AC is not cooling after trying everything? Let the professionals take over. 

CALL NOW +91 7980346473

Bespeak an AC service moment with Quick2Service and get back to chilling — literally.

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