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Why Is My AC Unit Running but Not Cooling?

June 28, 2024

Imagine powering on your cooling unit on an 85-degree summer day and breathing in a sigh of relief as you hear the motor release a sweet hum, indicating it’s on the job. You wait for your entire room to fill with the crisp controlled air. But what if you start wondering, “Why is my AC unit running but not cooling?”

Unfortunately, having the fan and blower motor function to no avail is not uncommon and leaves many Los Angeles residents in shock and terror. Luckily, Brody Pennell Heating & Air Conditioning helps you find answers and solutions fast. 

No Air Flow Due to Blocked Filters and Ducts

Air filters clean the air, trapping dirt, dust, pet dander, and other contaminants that pass through the meshy surface so it doesn’t settle on internal components (slowing down parts) or reenter your breathing air. 

After a while, the debris builds up, creating an impenetrable wall that allows allergens to stop airflow. Little to no air trickles out of your unit or air duct vents although the air conditioner is running, meaning your filters need replacing or cleaning. If the filters are fine, consider duct cleaning instead.

Warm Air Flow Caused By Dirty Coils 

What if you’re receiving proper airflow, but it’s not the air you want? When something halts the heat transfer process, room-temperature air escapes the vents, meaning the air didn’t receive conditioning in the unit. 

The air handlers suck in warm air, sending it over the evaporator coil that has refrigerant flowing within. The coolant absorbs the hot air, carrying it to the outdoor condenser unit for expulsion. Only cool air left behind rereleases indoors, but with dirty or frozen evaporator coils, the transfer doesn’t take place to cool your home.

So if you’re wondering, “Why is my AC unit running but not cooling?” call a professional to clean or defrost the coils and check refrigerant levels.

Not Enough Cool Air Due to Incorrect Unit Sizes 

Then, there’s the case where your system is blowing cold air, but it’s never enough to cool your home. If this has been an issue since the unit’s installation, you may have an undersized unit. A unit that is too small doesn’t have the appropriate BTU rating to provide enough cooling power to correspond with your home’s total square footage and may overwork to reach your thermostat setting. 

Eventually, parts prematurely decline. Your incapable unit’s lifespan shortens, costing you more in repairs and demanding an earlier replacement. An expert technician can measure your home to find the appropriate BTU rating and match you with the correctly sized unit.

Over 75 Years from a Five-Star Team!

You don’t realize how much your cooling unit does until you wonder, “Why is my AC unit running but not cooling?” Whatever issue arises, Brody Pennell Heating & Air Conditioning has seen it before within our 75 years in the business. So, take advantage of a team rated “The Best of the Southland” from 2021 to 2023 by the LA Times by calling (424) 341-0487 in Los Angeles and nearby areas!


About The Author

Brody Pennell

Since 1945, Brody Pennell Heating & Air Conditioning is the committed to helping homeowners in the greater Los Angeles area experience total home comfort. In 2021, the readers of the Los Angeles Times voted Brody Pennell the Best HVAC Company in the area.

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Danny M.
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The company was able to book an appointment quickly (same day) to fix our AC. Richie arrived on time and was professional and thorough. He was able to repair the issue and provide recommendations on other options. Appreciate the quick turnaround and quality service.
Carly S.
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I had a wonderful experience! Ruben could not have been more helpful, professional, kind, experienced and communicative. My system is very old and he was extremely knowledgeable about the older system. He did a thorough check and answered all of my questions. Wonderful customer care as well. I can't recommend Ruben & Brody Pennell more!
Matthew M.
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Juan Romo showed up right on time and was in and out in 10 mins. Great experience with this company, would 100% use again
Patricia B.
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Maurice& Alberto.M were Lovely & very thorough.
Cheng L.
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Very friendly and professional. Took the time to explain every thing.
Jerry S. B.
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Giovanny Quintero was very helpful in making our decision to upgrade. He took very clear & comprehensive photos of the existing problems in our system & then provided an accurate assessment & description of what the problems meant & how they would develop & worsen with continued use. My wife & I were very impressed with Giovanny, he was very knowledgeable & personable.
Susan W.
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Jose and Anthony were gracious polite and knowledgeable. Very professional maintenance visit.
Michele A.
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Juan Molina provided excellent service. He was knowledgeable, thorough, and kind! Highly recommend Brody Pennell.
Jessi D.
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Professional, friendly, and efficient service visit from Ivan and Angel today!
Nick E.
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Brett and Ruben were great today. Great customer service. Thank you.
Margo P.
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Ivan and Giovanni Ponce
keely M.
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Rene Morales is always on-time and very professional. Brody Pennell provides great service.July 2024Rene does great work, quick, thorough, and efficient. I always ask for Rene when it's time for maintenance.
James T.
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Very knowledgeable . Very friendly answered all my questions
Amanda M.
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Daniel and Ashton are very professional and kind. They made the entire experience seamless. Thank you!
zubin H.
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Daniel Avila was my technician and he was great. Very informative and did a great job.
Oly O.
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Maurice & Alberto.m worked on our system and was very nice and hard working me and Patricia bell recommend them coming back!!
Adam Exler G.
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Armando was very thorough and checked all the boxes during my bi-annual service call. He quickly changed my filters and was very cordiale and easy to work with as well.10/10!
Kevin X.
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Ivan came and helped me fix my AC today and it was as pain free and quick as could be! He replaced a part for us the same day and was a professional, kind young man. Couldn’t be happier to have working AC in the summer sun :)
Nancy K.
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Did a great job. I’m very pleased
Ray B.
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The technician provided excellent service. He was knowledgeable, professional, thorough, efficient, clean and courteous. Thank you.
Liz R.
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Maurice and Christian F were so knowledgable and professional! They were also very pleasant!! Can only say great things about them!!
Shirley W.
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Angel O. and Alberta M. were just here to do the yearly maintenance on our A/C. They did a fabulous job! So thorough and extensive. They were thoughtful and respectful and answered all my questions. They adjusted vents that will make our summer more comfortable. Could not be happier with the work and workers!
Jay S.
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Maurice went the extra mile and did an excellent job with tune up of our A/C unit. He shared photos, explained everything he was doing, made proper recommendations! Thanks Maurice!
Curtis J.
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James provided diagnosis that was.consistent with.his estimateI am satisfied with his work
lisa V.
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Anthony Manzo was here today to service my HVAC unit! He was an absolute pleasure having him in my home. Anthony is a total pro. Very knowledgeable and informative. He is welcome back anytime future service calls. Same goes for Supervisor Ashton K who also inspected my AC unit and advised me on options to replace my very, VERY old AC. Thank you Ashton, Anthony and Brody Pennell.Diego and Jose just finished installing my new 3.5 Ton Carrier AC. What a job. They were both lovely and super hard workers. They answered my silly questions throughout the day. They did a great job. Thanks all!
Jennifer K.
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Jason did a very thorough job and was a delight to interact with
Marjaneh R.
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Mr. Juan Molina was prompt professional and easily explained the situation and offered practical solutions. ThankYou
Rick H.
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Very polite and competent technician!
DeAnna T.
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Daniel (service tech) was timely and efficient. He clearly explained all the items serviced in both units (including pictures) and made recommendations to keep them operational.
Mark H.
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Anthony Monzo and David Escamilla were fantastic. They were able to access systems in really challenging locations and provide explanations of what was happening complete with photos and videos they took. Highly recommend them.Follow-up... The next week, a team came to install the new system led by Christian. It was a very difficult project but they were very thorough. Steven came the following day to trouble shoot a few issues and the following day Jose Rivera and Alessandro wrapped up the project. All folks were very professional and made sure to leave the house clean.
Gianni F.
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Rene did a great job - very knowledgeable and even gave me tips not related to the job that needed to be done. Oh and also very friendly!
David O.
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3/22 - clean, fast, courteous job with Troy and Phil. Very polite and thorough! Another fantastic job by the people at BrodyYet another pleasant service experience with Marcos!!! Also told me about an air scrubber install that Brody can do as well.10/9: another great job by Steven7/11/24: just another shoutout to Jose Castillo
Kevin B.
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great service from Brody Pennell. In particular, the technician who stopped by, James Handy, was courteous, very thorough and professional. Appreciate the continued good service
Tasha M.
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David Escamilla was professional, answered all my questions and never made me feel rushed. He took the time to explain what he was seeing with my A/C and the recommendations he was making for it. He even was able to complete work that wasn't scheduled for that day but was needed to make my A/C run better. I would recommend him and Brody Pennell for anything related for your heating and air conditioning needs they are extremely professional and I always feels great when using their business.
Vincent B.
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The technician was very professional and knowledgeable he kept me up to date on any issues …and I would recommend them
Alex D.
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Shawn was very knowledgable and patient with our questions. Great job!
Sam A.
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Christy K.
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Two thumbs up to Kevin and Ariel! They were efficient and very professional. Highly recommend.
Mike T.
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Steven came by do perform our AC maintenance and was incredible.He went above and beyond to insure our system was taken care of. 10/10
Carol Ann S.
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ReneExcellent Performance
JoAnn M.
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Cesar Corrales and Phillip Y were efficient and informative and did an excellent job.
Monique H.
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Brody Pennell is a great company! Very professional! I will use them again!Anthony Manzo was excellent!
Bil B.
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I had a great experience with Rene on his service call today. He explained everything he was doing while I watched. He was thorough and efficient.
Joe R.
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The team did a fantastic job cleaning and fixing the drain noises from our bathroom. They were very considerate, polite of our time and space. Would highly recommend them!
Beverly M.
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Desi was very helpful in resolving our air conditioning issues.
K. Ron N.
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Very professional, knowledgeable, and prompt.
LisaGay H.
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Dean K.
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James H. was fantastic - arrived during the agreed window, polite and friendly, found our problem with our AC unit's power supply and made a simple fix quickly. And only charged us the call-out fee because of that, which was really appreciate. Great service !!
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