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why is there a low hum coming from my A/C?
Posted On: September 17, 2023
A low hum coming from your air conditioning (A/C) unit can have several possible causes. It's important to diagnose and address the issue promptly to prevent further damage or inefficiency in your A/C system. Here are some common reasons for a humming sound in your A/C:
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Normal Operation: Some A/C units produce a low humming sound when they are running as part of their normal operation. This sound may be more noticeable when the A/C unit is first starting up or when it's working particularly hard to cool your home.
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Loose Parts: A loose or improperly secured component within the A/C unit can cause vibrations that produce a humming sound. Check for loose panels, fasteners, or brackets that may need tightening.
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Fan Motor Issues: The A/C unit's fan motor can develop problems over time, such as worn bearings or a misaligned fan blade. These issues can lead to humming sounds as the fan operates. If the fan motor is the problem, it may need to be lubricated, repaired, or replaced.
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Refrigerant Issues: A low refrigerant charge or other issues with the refrigerant lines can lead to abnormal noises in your A/C unit, including humming sounds. Refrigerant issues should be addressed by a professional HVAC technician.
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Electrical Issues: Faulty electrical components, such as capacitors or contactors, can produce humming sounds. Electrical problems should always be handled by a qualified technician to avoid electrical hazards.
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Compressor Problems: The compressor is a critical component of your A/C system, and problems with it can result in humming sounds. Compressor issues may require professional diagnosis and repair.
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Dirty or Clogged Condenser Coil: If the condenser coil becomes dirty or clogged with debris, it can affect the A/C unit's efficiency and create unusual noises. Regular maintenance, including cleaning the coils, can help prevent this.
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Ductwork Issues: Sometimes, the source of the humming sound may not be the A/C unit itself but rather an issue with the ductwork. Loose or improperly insulated ducts can transmit sounds from the A/C unit throughout your home.
If you're experiencing a low hum from your A/C unit, and it's not part of normal operation, it's a good idea to have it inspected by a professional HVAC technician. They can diagnose the specific issue and recommend the necessary repairs or maintenance to ensure your A/C system operates efficiently and quietly. Additionally, regular maintenance and cleaning of your A/C unit can help prevent many of these issues from occurring in the first place.
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Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
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Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!