Is Your Central Air Conditioner Not Cooling? These Might Be The Reasons!

The most common HVAC issues that people face is that the ac is not cooling enough and the central air conditioner not working. Most HVAC systems have a few common problems that you can check for to repair them yourself or call a certified practitioner for HVAC repair. The central air conditioner not cooling enough can be because of a variety of things.

We have listed below the ten most common issues that might be the reason why your air conditioner not cooling enough:

1. Thermostat not set to “AUTO”

A thermostat is a sensor that senses the room temperature and directs the compressor to start or stop the cooling cycle. If the thermostat is faulty the air conditioner does not cool at all or may cool enough.

The thermostat of your ac unit might be set to “ON” and this might be the reason why your AC blows out cool air sometimes and lukewarm air other times. At this setting, the fan just runs 24/7—even when the air isn’t being cooled. Setting the thermostat to AUTO will solve this problem.

2. Dirty air filter

If the air conditioner does not cool, the air filter might be clogged. In such case, air cannot flow through properly which greatly reduces the cooling capacity of the air conditioner. Either clean the air filter or reinstate it as needed. A dirty air filter reduces airflow into your AC, causing quite a few problems like the AC struggles to circulate sufficient cool air to get your home to the required temperature. The Evaporator coil freezes, turning into a block of ice that blocks air, meaning that your home gets very little cooled air at all. Checking the filter and changing it or cleaning it will solve this problem.

3. High atmospheric temperature

An AC has an optimal operating temperature (surrounding temperature) at which it can work most effectively. If the temperature shoots up beyond the optimum temperature limit, the efficiency of the air conditioner goes down. Sometime it is so hot outside that a stage is reached where the compressor stops working totally.

4. Dirty outside unit

Another general reason of your central air conditioner not cooling correctly is that the outside unit may be blocked. The evaporator absorbs heat from the air and then transports that heat to the condenser but the condenser can’t disperse heat if it’s soiled or crowded with debris. This causes your air conditioner to struggle to cool your home. You can clean the outside unit with a garden hose on a gentle setting. Do not blast it on a high setting or you’ll damage the fins that allow airflow to cool the condenser off. Sometimes weeds growing around the unit can also clog the vents so remove them regularly.

5. Small AC

A common mistake people make is that they buy an AC based on their budget and not based on the necessity of the room. A small AC in a big room will always find it difficult to cool the room in peak summers. The size of the AC should be according to the dimensions of the area.

Here are just a few problems that a professional air conditioning contractor may need to fix:

6. A faulty or broken condenser fan motor

A broken fan motor can reduce the efficiency of the outdoor unit’s fan and can’t help it dissipate the heat, meaning that the AC can’t cool your house.

7. Low refrigerant charge/refrigerant leak

Refrigerant is the fluid that absorbs the heat from the air. When you don’t have enough of this liquid, your AC can’t absorb enough heat to cool the air. The most common signs of refrigerant leak include ice buildup on the refrigerant line or on the outside unit, or a bubbling and hissing sound. Another sign is that the AC unit might not be able to cool efficiently on particularly hot days but works fine on cold days or nights.

If you see any of these signs, do not use your AC and call a professional as soon as possible because running the AC in this state can cause slugging in the compressor and spoiling it beyond repair.

Also Read: Types Of HVAC Systems That Can Be Used In Buildings

8. A Faulty compressor

A compressor is the main component of an air conditioning unit and is responsible for cooling your room. If the air conditioner does not cool, the compressor might be faulty. The compressor is a motor which compresses the coolant and circulates the refrigerant though the coils. If the compressor goes bad the cooling cycle does not begin and the AC fails to cool. This part is the most important part of your system and a failed compressor can lead to your ac not cooling enough. If there’s an issue with the compressor, you may need to replace it. Sadly the compressor is expensive so unless you have a warranty on it, you’ll probably need to replace an entire exterior unit.

9. Insufficient coolant

The coolant circulates through the evaporator coils and cools the air flowing over it and ultimately sends cold air into the room. So when the level of this coolant becomes deficient, the AC fails to cool. At this stage calling a professional HVAC company for coolant refill can solve this issue.

10. Defective AC Remote

Another common problem with HVAC systems is a faulty AC remote which does not deliver the correct signals to the unit. You can either replace batteries or switch to a new remote to solve this issue.

So these are ten of the most common issues which can lead to your air conditioner not cooling enough. Some of these problems can be solved at home without any professional help but some complex issues need a certified HVAC technician who understands the system and can provide a long-term solution.

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