AC not blowing cold air

Top Reasons Why AC Not Blowing Cold Air

There are a bunch of reasons why AC not blowing cold air. Take a look below to know more!!!


The Clogging of Air Filters – AC Not Blowing Cold Air

If you don’t change your air filters regularly, your AC might stop blowing cold air. Dust and dirt build-up in the filters, blocking airflow and causing the coils to freeze. This can lead to problems like hot air blowing out, higher bills, and water leaks. To fix this, change your air filters every month.


Incorrect Setting of The Thermostat

If your AC isn’t blowing cold air, the thermostat setting could be the problem. If it’s set higher than the current temperature, the AC might not turn on.

For example, if it’s 24°C but you’ve set it to 27°C, you won’t feel cold air. Also, if the AC is on “Auto” instead of “On,” it might not cool properly. First, check if the shut-off switch is on and the breakers aren’t tripped. Then, reset the thermostat to a few degrees lower than before. If it’s 25°C in your home, set it to 20°C. Wait a while, then feel the vents for cold air. A simple reset could fix the issue.

Dirty Evaporators

As an air conditioning system owner, you know the evaporator is crucial for cooling your home effectively. Without a clean evaporator, your AC won’t work well, especially in hot weather. So, it’s important to check and clean it regularly. As a regular user, aim to clean it every 6 months to a year to maintain proper functioning.



The Size of The Air Conditioner

If you choose a small air conditioner for a big home, it might not cool the space enough. Make sure to get an AC that matches your home’s size. Small homes need compact models, while larger homes require bigger AC units. Using a small AC in a large room can affect its performance, leading to inadequate cooling. Similarly, using a large AC in a small room can make it too cold, possibly causing health issues.



Damaged Compressor

The compressor is a key part of the AC system, helping move the refrigerant between the condenser and evaporator. If it’s damaged, the AC won’t cool properly. It’s best to replace a damaged compressor in such cases.



Dirty Condenser

Check if the outdoor unit’s condenser is dirty. If it is, wash it. Dust and dirt in the condenser can strain airflow, leading to overheating. This can cause the compressor to trip frequently, preventing the AC from cooling properly. Clean the condenser using water pressure to ensure it’s free from dirt and dust.



Leakage in The Refrigerant

Refrigerant cycles are essential for an air conditioner to work. If there’s a leak in the refrigerant, your AC won’t blow cold air. Don’t use the AC if you suspect a refrigerant leak, especially if you hear a hissing noise when it starts. Frozen components can also indicate a leak.



If The Blower Gets Blocked

If you don’t clean the AC filter, dust can build up in the blower, preventing it from blowing cool air. This is a key reason why your AC might not cool properly. Plus, the fan motor in the indoor unit could get damaged. If you notice the motor isn’t working or the AC’s motor speed is slower, it could be due to a weak capacitor in the fan motor. In these cases, your AC won’t blow cold air effectively.



Leakage in The Air Ducts

Over time, air ducts can become sealed and lose insulation, causing air leakage. This means too much cool air escapes, making it hard for rooms to cool properly. If your AC’s air ducts are old, schedule an inspection to prevent this issue.



Faulty PCB and programming issues

When you turn on your AC, there’s typically a three-minute delay before the compressor starts. During this time, electricity is supplied to the outdoor unit. If you try to change the mode using the remote control before the compressor starts, you’ll notice the compressor isn’t running. This means cold air won’t blow immediately, leaving you in warm temperatures. Sometimes, the PCB fails to supply electricity to the outdoor unit, causing the AC to not blow cold air. To keep your AC working well, service it every three months to improve output and efficiency.


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23 thoughts on “Top Reasons Why AC Not Blowing Cold Air

  1. Thank you so much dear Sonam ma’am! We are glad to say that we are very happy with your feedback. thanks for visit! keep sharing! 🙂

  2. While checking on my brother’s vacation house the other day, I had noticed that there was a large amount of liquid springing from one of the AC units at the back of the house. I had initially thought that this was just condensed water, but I never knew that refrigerant can also leak from a unit and cause warm air to circulate instead of cold air. I may need to consult with my brother about this so we can look for an AC contractor to help us out, but I’ll keep the rest of your tips in mind in case we need to get our ACs checked again. Thank you!

  3. It’s about four days now since my air conditioning system at home hasn’t been emitting cold air and been producing noise when I’m using it. I had no idea that when I hear any hissing noise coming from the ac unit, this means that there may be a leakage within the refrigerant. With that being said, I shall then find a repair contractor to see the damage and fix it.

  4. Oh My God!!! This is a great blog, I am happy that I have come across this one. It’s an amazing blog to read ac not blowing cold air . Thanks for this wonderful content. I loved reading your article, will definitely give it a try to store as per your advice. Great blog to share!!

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