Aircon not blowing cold air? : 4 things you can do


One of the most common complaints is why aircon not cold enough after using it for some time. A common question we faced with is “why is my aircon not blowing cold air?” People are often upset or uncomfortable if the aircon not cooling as it creates a warm and unpleasant environment. Sometimes, the aircon not cold in one room which causes a major inconvenience to the person in that room. Indeed, after prolonged use, the aircon is not cold enough anymore. Or the aircon is not blowing cold air. But this is inevitable due to the wear and tear of important components within the aircon.  Instead of jumping directly to Aircon repair. We have to understand why your aircon is not cold. And what you should do when faced with this issue. Do refer to the following 5 things you can do when your aircon is not blowing cold air.


If you are too lazy to read,



Common Reasons Why Your Aircon Isn’t Cold

Low Refrigerant Levels

Refrigerant is the lifeblood of your aircon system, crucial for cooling your space. Low levels often indicate leaks or undercharging, leading to insufficient cooling.

    • Explanation: The refrigerant is the substance that cools the air within your aircon system. If the levels are low, usually due to leaks or undercharging during installation, the aircon cannot cool effectively.
    • Signs: The aircon is running but not cooling, ice formation on the refrigerant lines, and hissing or bubbling noises indicating a leak.
    • Solution: It’s essential to have a professional technician locate and repair the leak, then recharge the system with the correct amount of refrigerant.

Dirty Air Filters

Air filters play a pivotal role in maintaining air quality and ensuring efficient airflow. When clogged with dust and debris, they can significantly hinder your aircon’s performance.

      • Explanation: Air filters trap dust, pollen, and other airborne particles. Over time, these filters can become clogged, restricting airflow and reducing the system’s efficiency.
      • Signs: Reduced airflow, ice on the evaporator coils, and a noticeable drop in cooling efficiency.
      • Solution: Regular cleaning or replacement of air filters is crucial. For most systems, filters should be checked monthly and cleaned or replaced as needed.

Thermostat Issues

The thermostat is your command center for controlling the aircon’s temperature. Issues with its settings or functionality can disrupt the entire cooling process.

      • Explanation: The thermostat regulates the temperature by signaling the aircon when to start and stop cooling. If it’s malfunctioning or incorrectly calibrated, it can cause the aircon to not cool properly.
      • Signs: The aircon runs constantly or not enough, temperature inconsistencies, or the aircon doesn’t respond to thermostat adjustments.
      • Solution: Check if the thermostat is in the correct mode and set to a cooling temperature. If problems persist, it may need recalibration or replacement.

Regular Maintenance

Consistent maintenance is the key to a long-lasting and efficient aircon system. It involves routine checks and repairs that keep common aircon issues at bay.

  • Importance: Regular maintenance, such as aircon servicing in Singapore, is vital to prevent these common issues. It ensures all parts are in good working condition and can identify potential problems before they worsen.
  • Services Included: Professional servicing typically includes cleaning of filters, checking refrigerant levels, inspecting the thermostat, and overall system inspection.
  • Benefits: Regular maintenance extends the lifespan of your aircon, improves efficiency, and ensures consistent cooling performance.


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Troubleshooting Tips for Aircon Not Blowing Cold Air

Check and Clean the Air Filters

Regular inspection and cleaning of air filters are essential for optimal aircon performance. Dirty filters can obstruct airflow and reduce cooling efficiency

Why It’s Important: Clogged or dirty air filters restrict airflow, reducing the efficiency of your aircon.

What to Do: Remove the filters and check for dirt and debris. Clean them gently with water or replace them if they are too dirty or damaged.

Ensure Correct Thermostat Settings

Proper thermostat settings are crucial for maintaining the desired temperature. Incorrect settings can lead to ineffective cooling and increased energy usage.

Why It’s Important: Incorrect thermostat settings can prevent your aircon from cooling properly.

What to Do: Verify that the thermostat is set to ‘cool’ mode and the temperature is lower than the current room temperature. Also, check if the batteries need replacing.

Inspect the Outdoor Unit

The outdoor unit is a critical component of your aircon system. Ensuring it’s clear of obstructions and damage is vital for efficient operation.

Why It’s Important: Blockages or damage to the outdoor unit can affect the aircon’s cooling ability.

What to Do: Look for any obstructions like leaves or debris around the unit. Ensure there’s no visible damage. Keep the area around the unit clear.

Check for Refrigerant Issues

Refrigerant levels are fundamental to your aircon’s cooling ability. Low levels or leaks can significantly impair cooling efficiency.

Why It’s Important: Low refrigerant levels can significantly reduce cooling efficiency.

What to Do: Listen for hissing or bubbling noises, which can indicate a leak. However, dealing with refrigerant requires professional help due to its hazardous nature.

Seek Professional Help for Complex Issues

Some aircon problems require expert knowledge and skills. For intricate issues, professional servicing is the safest and most effective solution.

Why It’s Important: Some problems, especially in specific models like a Mitsubishi aircon not cold, require expert knowledge.

What to Do: If the above steps don’t resolve the issue, it’s time to call in professionals for aircon servicing. They can handle complex issues safely and effectively.

Expert Solutions for Aircon Cooling Problems

For persistent issues like an aircon not cooling, expert intervention is often needed. This could involve a thorough aircon chemical wash or repairing parts like the compressor. Brands like Daikin aircon and Panasonic aircon might have specific maintenance requirements, so consulting with a specialist is advisable.

How to Diagnose Your Aircon Cooling Issue

Diagnosing aircon issues effectively requires a systematic approach to identify and resolve the underlying problems. Here are key steps to follow:

Listen for Unusual Noises

    • Details: Unusual noises like hissing, banging, or clicking can indicate various issues, from refrigerant leaks to mechanical failures.
    • Action: Note the type of noise and when it occurs. This information can be crucial for professionals in pinpointing the issue.

Check for Ice Buildup

    • Details: Ice buildup on the coils or other parts of the aircon unit often suggests airflow problems or refrigerant issues.
    • Action: Inspect the evaporator coils for ice. If present, turn off the unit to let it thaw and check the air filters for blockages.

Ensure the Fan is Working Properly

    • Details: The fan circulates air over the evaporator coils to cool the room. A malfunctioning fan can lead to poor cooling performance.
    • Action: Check if the fan is running when the aircon is on. A non-working fan might need a simple repair or replacement.

Inspect the Thermostat

    • Details: An incorrectly calibrated or malfunctioning thermostat can cause the aircon to not cool properly.
    • Action: Verify the thermostat settings and recalibrate if necessary. Consider replacing it if recalibration doesn’t solve the issue.

Evaluate Airflow

    • Details: Reduced airflow can be a sign of a clogged filter, blocked ducts, or a failing motor.
    • Action: Check for any obstructions in the vents and ensure the filter is clean. Listen for any unusual motor sounds.

Special Considerations for Car Aircons

    • Details: For car aircons not cooling enough, the issue might lie in the AC liquid line being very hot, indicating a refrigerant problem or a malfunctioning compressor.
    • Action: Feel the temperature of the AC liquid line. A very hot line requires professional inspection, as it could indicate a serious issue with the refrigerant system.

By following these steps, you can effectively diagnose common issues with your aircon unit. However, for complex problems or if you’re unsure about any step, it’s always advisable to seek professional help. Regular maintenance and timely repairs can significantly extend the life of your aircon and ensure it operates at peak efficiency.

When to Call a Professional for Aircon Repair

Understanding when to call in the experts for aircon repair is crucial in maintaining the longevity and efficiency of your cooling system. If you’re experiencing persistent issues such as weak airflow, strange noises, or your aircon is not cooling effectively despite your troubleshooting efforts, it’s time to consult a professional. At Silverbackaircon, we specialize in diagnosing and fixing complex aircon issues with precision and care. Whether it’s a residential or commercial unit, our team of skilled technicians is equipped to handle a wide range of aircon problems. Don’t let a malfunctioning aircon disrupt your comfort. Visit us at https://silverbackaircon.sg/ for expert aircon repair services. We ensure a swift and effective solution, getting your aircon back to optimal performance and ensuring your environment remains comfortable and cool.

Maintaining Your Aircon for Optimal Cooling

Regular maintenance is key to keeping your aircon in top condition. This includes cleaning filters, checking refrigerant levels, and ensuring the aircon thermostat is functioning correctly. For specialized units like cassette aircon, following the manufacturer’s maintenance guidelines is crucial.

Understanding Aircon Refrigerant Issues

Refrigerant issues are a common culprit when your aircon isn’t cooling properly. This substance is essential for absorbing heat, making it crucial for effective air conditioning. If you notice your aircon’s performance dropping, it could be due to a refrigerant leak or low levels. Handling these issues often requires professional skills, particularly for complex systems.

Cost-Effective Solutions for Non-Cooling Aircons

Simple Fixes – Cleaning Air Filters and Adjusting the Thermostat:

    • Cleaning Air Filters: One of the most common reasons for an aircon’s reduced efficiency is dirty or clogged air filters. Over time, filters accumulate dust, pet hair, and other debris, which can obstruct airflow and reduce the system’s efficiency. Cleaning these filters is a straightforward task that can often be done without professional help. Most aircon filters can be easily removed, cleaned with a gentle brush or vacuum, and then rinsed with water. Allowing them to dry completely before reinserting them is crucial. This simple maintenance can improve air quality and cooling efficiency.
    • Adjusting the Thermostat: Sometimes, the issue might be with the thermostat settings. Ensuring that the thermostat is set to the appropriate temperature and mode (cooling mode in summers) is essential. Sometimes, recalibrating or replacing an old, faulty thermostat can solve the problem. This is a relatively inexpensive fix compared to other repairs.

Targeted Repairs Over Full Replacement:

    • When an aircon unit faces more severe issues, like unusual noises, water leaks, or complete lack of cooling, it might require professional attention. However, it’s often more cost-effective to repair specific components of the unit rather than replacing the entire system. For example, replacing a faulty compressor, fixing a refrigerant leak, or repairing the electronic control board can be much cheaper than buying a new aircon. It’s important to have a qualified technician diagnose the problem accurately so that only the necessary repairs are made.

Regular Maintenance to Prevent Costly Breakdowns:

    • Regular maintenance is crucial for keeping an aircon unit running efficiently. This can include annual inspections and servicing by a professional, as well as regular cleaning and filter changes. During a maintenance check, a technician can identify and fix potential issues before they become major problems, ensuring that the unit operates at peak efficiency. This proactive approach can save money in the long run by avoiding the high costs associated with major repairs or complete system failure.

Ensuring Efficient Operation:

    • Beyond repairs and maintenance, ensuring that your aircon unit operates efficiently can also save money. This includes using programmable thermostats to control usage, ensuring that your home is well insulated to prevent cool air from escaping, and closing curtains or blinds during the hottest part of the day to reduce heat gain. These steps can lessen the workload on your aircon, thereby extending its lifespan and reducing energy costs.

In summary, when dealing with a non-cooling aircon, starting with simple, cost-effective solutions like cleaning filters and adjusting thermostats is wise. If problems persist, targeted repairs can be more economical than a full replacement. Regular maintenance is key to preventing expensive breakdowns and ensuring the unit’s efficiency. Additionally, adopting practices that enhance the overall efficiency of your cooling system can contribute significantly to cost savings and improved performance.

Preventive Measures to Keep Your Aircon Cold

Importance of Preventive Maintenance

  • Proactive Approach: Preventive maintenance involves taking proactive steps to maintain your aircon system, rather than waiting for problems to manifest. This approach not only helps in maintaining a consistent cooling performance but also extends the lifespan of the unit.
  • Cost-Effective in the Long Run: Regular maintenance can seem like an added expense, but it’s cost-effective in the long run. It helps avoid major breakdowns that can be costly to repair and reduces the likelihood of needing a premature replacement of the entire system.

Key Preventive Measures

Regular Checks and Servicing:

    • Professional Servicing: Schedule regular servicing with a qualified technician. This typically includes cleaning components like the condenser and evaporator coils, checking the refrigerant levels, inspecting the compressor, and ensuring all electrical connections are secure.
    • Self-Maintenance Tips: In addition to professional servicing, certain maintenance tasks can be performed at home. This includes regularly cleaning or replacing air filters and ensuring that the area around the external unit is clear of debris.

Thermostat Management:

    • Functionality Checks: Regularly check that the thermostat is functioning correctly. A malfunctioning thermostat can lead to inefficiencies in how the aircon regulates temperature.
    • Smart Thermostats: Consider upgrading to a smart thermostat. These devices offer more precise control over your aircon system and can learn your preferences to optimize cooling and energy usage.

Fan Maintenance:

    • Regular Inspection: Ensure that the aircon’s fan is in good working condition. A faulty fan can lead to poor air circulation and reduce the system’s cooling ability.
    • Cleaning and Repair: Keep the fan blades clean and free from dust. If the fan is noisy or not functioning smoothly, it may require professional attention.

Tailored Maintenance for Different Aircon Types:

    • Central Air Conditioning: For central air systems, it’s important to ensure that ductwork is sealed and insulated, as leaks can significantly reduce system efficiency.
    • Window and Portable Units: These should be checked for proper sealing and insulation to prevent cool air from escaping.
    • Split Systems: Regular cleaning of both the indoor and outdoor units is crucial, as is ensuring that the refrigerant level is adequate.

Seasonal Preparations:

    • Before Peak Seasons: Prior to the onset of summer or any peak usage season, have your aircon checked and serviced. This ensures it’s ready to perform efficiently when needed most.
    • Post-Season Maintenance: After the peak season, it’s good to have a check-up to address any issues that may have arisen during heavy usage periods.

Benefits of Preventive Maintenance

  • Increased Efficiency: Regular maintenance keeps your aircon running at optimal efficiency, which can translate into lower energy bills.
  • Improved Air Quality: Clean filters and coils mean better air quality as the system is less likely to circulate dust and allergens.
  • Reliability: With regular checks, your aircon is less likely to break down unexpectedly, providing reliable cooling especially during hot weather.

Frequently Asked Questions

1. What should I do if my aircon is not blowing cold air?

This can include understanding if it’s a problem of no cold air or no air at all, checking the number of indoor units affected, and the last time gas was topped up.


2. Why might my aircon not be cold enough?

Possible reasons include dirty air filters, refrigerant leaks, air duct leaks, dirty evaporator coils, or incorrect thermostat settings.


3. What are common reasons for an aircon not cooling?

This covers a range of issues from mechanical faults like a broken compressor to blockages in the condenser.


4.  How often should I service my aircon to prevent cooling issues?

Discusses the importance of regular maintenance and its frequency to ensure efficient cooling.


5. What professional services can help if my aircon is still not cooling after basic troubleshooting?

This could involve more in-depth inspection and repairs from experienced technicians.


6. Air conditioner not blowing cool air?

Most likely due to a dirty air filter or low refrigeranEnsure proper ventilation and check if the air filter is clean; also verify that the aircon’s capacity matches the room size for optimal cooling.t levels; regular maintenance and checking for any leaks or blockages can resolve this issue.


7. Trentios portable aircon not cold?

Ensure proper ventilation and check if the air filter is clean; also verify that the aircon’s capacity matches the room size for optimal cooling.


8. car ac only works at night?

This could be due to higher day temperatures overworking the AC or a refrigerant issue; consider checking refrigerant levels and the car’s AC system pressure.


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