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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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See What Our Customers Are Saying:
Jun 4, 2018
End to end service. From quote, overseeing installation, contacting and making arrangements for energy audit. Warranty program is comprehensive. Cleaned up mess of assistant walking through my place without proper indoor foot covering when I pointed out that I was not happy about footprints on my floors.
Jun 11, 2018
In April we hired Twintech Heating & Cooling to replace our 20 year old water tank & 35 year old air conditioner. We got 5 estimates for the job & decided to go with Twintech for the following reasons.
- The Sales Manager, Dave, was very personable & knowledgeable as all of our questions were answered. (We had a list of questions we asked each of the contractors when we got the estimates)
- We got 5 estimates for the job. All contractors verbally told us they had the required qualifications but Dave was the only one to physically show us their license & insurance documentation.
- Twintech carried the Napoleon air conditioner & we wanted to support Canadian industry as it is assembled in Barrie On.
Safety is important at Twintech as demonstrated when we discussed with Dave, the need to change our install date because of freezing rain. Access was required by navigating a set of outside steps & Dave identified that safety took precedence.
On the installation date, Greg, Peter & Grant showed up on time & methodically accomplished the removal & installation of both units. The guys did a great job cleaning up as well.
When the job was completed we mentioned to Greg that we were pleased with the work they had done & were going to have them come out & do our furnace inspection in Sept. Greg said we can save our money as he had inspected the heat exchanger on the furnace while doing the job & there was no need to have another inspection in Sept. We were very impressed with Gregs initiative. This is top shelf service. Thank you Greg.
As the weather was too cool to complete a functional test of the air conditioner on the installation date, Dave made a follow-up call to us to see how things were going & Greg also came out to check the operation. No problems.
We are very happy we hired professionals like Dave, Greg, Grant & Peter & have no hesitation in recommending Twintech Heating & Cooling. They will now be our "go to" guys.
Nov 18, 2018
These guys are the best. From start to finish they exceeded my expectations and delivered a great product. They accommodated the nuances of my 100 year old home which was really appreciated. The install was easy to schedule and done fantastically. Im so excited to have an efficiently heated and cooled home.
Aug 12, 2018
Twintech were fast and efficient contractors. It only took 48 hours between an initial home visit and complete installation. The workmen were polite and hardworking. The site was left clean with the old furnace etc. removed. They helped arrange an environmental assessment in order that I could receive the maximum rebate. They even called me within a week to determine if I was satisfied with their work and to reassure me that I could call them anytime I experienced heating difficulties or had any questions. I recommend Twintech for your heating problems.
Jul 21, 2018
Courteous and professional service from initial consultation through to the installation. We highly recommend Twintech for outstanding service in the industry. Competitive pricing, professional and accurate advice, attention to detail, respect for their client's home and cleaning up at the completion of installation.
Jul 12, 2018
Last night was the coldest day of the year so far and I woke up to my house being 54 degrees... I called Twintech at 2:45am and Greg was on site by 3:30am. The furnace required a part and he returned to his shop and came back to my home around 4:15am, furnace up and running by 4:30am. THANK YOU TWINTECH! Your service is second to none.
Jun 25, 2018
After much research & getting 4 quotes, we hired Twintech team for our new furnace installation, prices were fair, they carried great product brands & more importantly installation was expertly done by one of the owners (Greg & his assistant Peter) which gave me an added piece of mind. Dave was very organized & answered all my questions in great detail, especially re: the Enbridge & Govt. rebate program.
Jun 10, 2018
My old air conditioner was 20 years old and developed a Freon leak and it was more cost effective to replace rather than repair. There are a large number of heating and air conditioning companies available in my area so I contacted several for quotes. Twintech heating and cooling responded quickly to the inquiry I left on their website and their sales person Dave came by the following day. He was knowledgeable about the field and was able to show copies of the various refrigeration and gas fitting licenses along with workmens compensation, TSSA and other certifications. He also suggested a particular manufacturer and model of AC unit appropriate to my house and gave me a quote. Since the price was reasonable, service had been good and the reviews on the internet were also good, I decided to purchase an AC unit from them. Installation was quickly scheduled. They showed up on time, did a good job installing the new unit including some sheet metal work to get the new heat exchanger to fit in the furnace duct, and cleaned up afterward. In addition, they noticed that my existing AC was installed too close to the furnace exhaust (based on building code) and were able to mount the new AC the appropriate distance from the exhaust. Overall, they did an excellent job and were a pleasure to work with.
Jun 5, 2018
All interactions from sales to installation were Courteous and professional. The installation was seamless and the attention to detail including clean up was outstanding. I highly recommend TwinTech Heating and Cooling.
May 17, 2018
Twintech's Salesman Dave arrived promptly was friendly and courteous, listened and assured us the installation would be completed according to our requests. The crew arrived early morning on May 11th, 2018 and worked through till late afternoon non-stop. They were very friendly, very professional, their expertise was excellent, their workmanship outstanding and the installation was completed in a timely and efficient manner. We were completely satisfied and happy with the quality of the work.