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Reasons Why My Air Conditioner Is Not Cooling My House

Have you ever come home after a hot, and all you want is to sit by the AC and cool yourself, only to be disappointed by the AC doing nothing? This could be frustrating and alarming, especially if you did not expect it to happen. But what could be the reason why your AC fails to cool the air inside your house? Like every machinery, there is always a reason behind a specific behavior. The air conditioner failing to cool the air inside the house could be triggered by various reasons.

Clogged Air Filters

Surprised? Yes. Something as simple as a clogged filter can be the reason behind your woes. When the air filters accumulate too much dirt and dust and forget to replace them, they restrict airflow. This interferes with the proper functioning of the unit, thus reducing its ability to cool the air around significantly. It is advisable to constantly replace or clean the filters depending on the type you are using.

Dirty Condenser Coils

If you notice your AC is not cooling the air around as it should, yet the air filters are clean, the next possible culprit would be the condenser coils. This may have accumulated a lot of dirt and debris over time that they cannot dissipate heat outside appropriately. Unfortunately, as the coils become dirtier, the AC loses its cooling ability, forcing it to compensate. This may cause the unit to overload and overstrain, leading to more severe problems. To fix this, clean the condenser coils or call an HVAC professional to inspect and clean them appropriately.

Insufficient Refrigerant

Your HVAC system is less likely to cool the air around effectively if it does not have enough coolant. This coolant flows through the condenser coils, cooling the air around it before pushing the cold air into other room parts. If the coolant is too low, it will not work efficiently. This is a complex problem that you should never attempt to handle. Instead, call an AC expert to help refill the coolant, and restore everything to normal.

Damaged Compressor

A faulty compressor may be behind your AC cooling troubles. Generally, the compressor is the powerhouse of the AC and is said to be responsible for cooling the house. As such, a defective compressor interferes with the cooling efficiency. When the compressor/motor fails to compress the coolant or refrigerant, there will be no circulation in the evaporator and condenser coils. In most cases, when the compressor breaks down, the cooling cycle fails to start, which in turn causes the AC to fail.


Everything about the HVAC system may be perfect, but the AC still fails to cool your house. In such a case, the thermostat may be the issue. Since it serves as the sensor that depicts the temperature around the house and communicates with the compressor to start or stop the cooling cycle, it needs to be working correctly throughout. The communication is topped if the thermostat breaks down, and no cooling will be initiated.

Wrong Size for Square Footage

Not many homeowners appreciate the need to have the correct AC size. It is not enough to buy an AC that fits your budget, mainly if it does not serve the needs of your home. Before spending any cash on an AC, have the HVAC professional come around and access the requirements in your home. They can then recommend the right sized AC that will not overwork or underwork.

Unfortunately, not many homeowners heed this recommendation, and many buy undersized ACs. Installing a small AC in a large room will not compete favorably during peak summer seasons. No matter what you do, the AC does not match the room’s needs and will not keep the space cool. In such cases, only replacing the AC with the appropriate size will be helpful.

Leaking Ductwork

This can happen in old homes where the ductwork is old and due for repair or replacement. A leaking air duct can cause the AC not to cool your space even when it is running. It is important to properly seal the ductwork system to ensure that cool air does not leak into attic space. If you suspect that there is leaking ductwork, consider requesting professional assessment and repairs. Sometimes the AC fails to cool your area simply because it is old and weary. You may have to replace the AC to salvage this situation because repairs will only offer temporary solutions.

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Customer Reviews

Claudia M.

Scott, along with his associate, Gabe, did a great job. They were both professional and friendly. Scott explained in enough detail to help me understand how my a/c unit works-he’s very informative. Have was a great help, cutting the time it took to clean and install the HVAC equipment. I liked that they were both pet friendly, that’s also important for me. I’ve been a customer of absolute Airflow for a couple of years and they are a great company …

Ty S.

Have had nothing but amazing experiences with Absolute Airflow from the beginning. We have had a few issues here and there but Absolute has always sent someone out quickly and stood behind their work. Most recently they sent out Spencer and he was the best technician we’ve ever had! He was extremely respectful and polite, he also took the time to thoroughly talk me through and help me understand the genesis of our various issues we were encountering. Definitely hope …

Ian S.

My requested service was set up by Marcus who came to my home to evaluate and was prepared with options and great prices for my water heater replacement. Was able to get an appointment within 3 days as there was no emergency. My install tech James was amazing, He was very respectful and maintained a clean and organized work area as the installation was in the home. The removal, prep, and installation of new water, gas, and venting took approximately …

Richard S.

I can’t express enough how impressed I am with this company and especially Anthony Belt. Anthony was so thorough and patient with my wife and me. The impressive part was he was able not only to identify all the problems with my heating and ac but went above and beyond to fix all of them! My electrical bills were over $500 a month during the ac months and now they are less than $200! Not only am I saving a …

Patrick K.

I haven’t posted any reviews in a long while but here I am thanks to SCOTT with Absolute Airflow. The warmer Cali weather is around the corner and as a responsible homeowner, I decided to get my HVAC system checked out and tuned up before the summer heat. Scott provided us with the full red carpet experience. His knowledge, quality and care put into his work, and professionalism were all outstanding. Replaced fan motor due to oil leak (a normal …

Liem H.

Outstanding experience from the start. I’ve been a member of Absolute Airflow for almost 2 years now. Since then, I’ve had my system maintained twice a year. Every service has been very thorough and professional. Each time, everything was explained to me in terms that I would understand, coupled with plenty of photo documentation. Which I appreciate so much. Knowing that I would have to replace my aging system. I dreaded the coming expense and experience. But my fears were …