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Common HVAC Noises to Be Aware Of

January 16, 2018

Whether it is a soft hum from the equipment or a whooshing air from the vents, it is normal for your HVAC system to create some noise. After all, it is comprised of various components working together to serve its function. Certain unnatural and disruptive sounds, however, may signify deeper or worse problems. It is important not to ignore them, as they might help you determine if you need repair or even an upgrade.

Here’s a look at some of these signs.

Common HVAC Noises and Their Meanings

The best way to prevent problems down the road is to work with a trusted HVAC contractor for timely inspections and tune-ups. That said, it pays to know which sounds are normal and which aren’t so you can take immediate steps to mend them. Take note of the following:

  • Clanking. HVAC systems in great condition usually produce a humming noise. But if it is clanking, this could imply serious issues. The blades, blower motor fan, or pipes might be loose or detached, causing them to rub or strain against each other. This can lead to major damage when left neglected or actual physical danger to your person. Switch off the unit at once and have an expert repair it as soon as possible.
  • Rattling. This could indicate a few problems. If the rattling noise comes from the outdoor equipment, there is external debris, such as a twig, stuck in the system. Even if the grate could keep large debris out, smaller ones can still pass through. Before removing the debris, turn your system off. If you notice signs of damage on the compressor, fan, or condenser, seek the help of a technician. Do the same if the rattling originates from an internal component, as removing the obstacle is a bit complex.
  • Hissing. This usually means air leakage. When the hissing is coming from the walls, your ducts might be damaged. This can increase your energy costs because instead of dispersing throughout your living space, the air is discharged into the walls.

Keep in mind that you should only call a technician to come over when your unit is making a loud hissing noise. If the hissing is light, this implies that your filter is not secured properly. You might also have the wrong filter size, forming a gap in the seal. This can be easily repaired by replacing the filter with a more appropriate one for its size, which would get rid of the sound.

Brody Pennell: The Trusted Name for Top-Notch HVAC Services

As your reliable source of first-rate HVAC services, Brody Pennell can assess your units once you hear any of the aforementioned noises. We are experienced and trained in all types of HVAC systems, whatever the brand or make. We will determine the source of the problem and provide the necessary repairs so you can keep your heating and cooling equipment quieter, safer, and more efficient.

Since 1945, homeowners and commercial property owners have come to rely on us to provide them with exceptional HVAC solutions. Get in touch with us today at (310) 836-0606 for more information.


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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stephanie C.
1714102943
Jose Rivera came to replace Thermostat on a newly installed system. He explained the whole process very well. It was an exceptional and spotless installment, would definitely recommend to family and friends. He deserves 5 stars, will have him working with us again.
Brian K.
1714095576
Great, friendly, knowledgeable, and professional service! Enrique, Danny and Nathan did an excellent job of duct cleaning our hvac system. They were polite, professional and very friendly.
Marcia W.
1714093751
Tony M and Jose were both here for our 6 month checkup and they were extremely thorough, explained everything, and very nice. Would highly recommend them.
Steve L.
1714085783
Tristen and Juancho were efficient and friendly and explained everything clearly.
Debra M.
1714085316
Excellent service by Juan Munoz, Daniel Picard, Brian Diaz, and Juan Sanchez. Very helpful in explaining the HVAC installation process and helping set up new thermostat. Extremely kind and helpful. I recommend Brody Pennel for any HVAC installation or repair.
S O
1714085187
Maria was pleasant and did an excellent job. Explained everything very clearly. Very happy with the service.
Eva B.
1714084317
JuanMolina serviced my ac and heating today He was very polite and helpful,
Tony G.
1714083874
Our regular semi-annual service was performed today and Rene, our technician, did a terrific job, showing care and attention to detail. He's very friendly and informative and made sure we had all our questions answered and were completely satisfied.
Shari M.
1714082673
Marco is the best!!!!
Liza U.
1714081448
Kevin and David E were great4/25/24 Juan C and Gio Q were awesome and helped in everyway. Thanks guys
S M
1714078921
Daniel B & Jose CWe're very polite and courteous and worked very proficiently and efficiently and were able to inform us of the exact problem which was great. I would not hesitate to call on these guys for HV assurance. Thanks Daniel & JoseOn 4/25/2024 Daniel B & Jason S provide our company with best care that we find truly impeccable and would recommend this company and these workers to any other establishment and wouldn't want anyone but the best and these guys are the best in our opinion.
beatles341
1714077166
Jose C. was a great technician to work with. Excellent customer support and service.Ivan D and Kevin L are great guys. They did the maintenance for my property around a month ago. 4/25/24
brett H.
1714076214
My technicians did a great Job ! Steven and Leo.H I would definitely use them again and recommend them.
peter B.
1714076196
Kevin L. and Ivan D. were great and outstanding technicians, efficient, thourough, and wonderful. Please send them back again.
Norman M.
1714074725
Armando and Richie completed a comprehensive inspection and cleaning of my HVAC system. They were thorough and professional, and courteous .I am pleased with their work. Thanks Brody-P.
gloria R.
1714070730
Juan Romo was amazing super knowledgeable and friendly!!!! Amazing service
Helen S.
1714006075
I’ve been with Brody Pennell for many years, and I’m very happy with their service. James Handy is particularly amazing, and I was very fortunate to have him on my most recent maintenance services. He gave me great advice and did a fantastic job.
Denise H.
1714001375
Steven was great!
Kathy N.
1714000925
Juan Romo checked my heater in great detail today and gave me a full report on its welfare. He has suggested the repair of the heat exchanger due to wear and tear . He also pointed out a problem with the circuit board and one small section. He was very thorough, and I understood exactly what he was saying. I commend him highly! Kathy Naylor
Josh E.
1713989240
Juan Molina: thorough, neat, informative & pleasant.
david C.
1713988327
anthony manzo and armando n . great job efficient
Margarita C.
1713984415
Excellent job by Rene Morales 10 stars.
Ana A.
1713981385
Amazing service, very nice attitude, Leo H, Ruben M and Ivan D have extraordinary customer service
David S.
1713979878
Had Jason come by to add surge protector and he did a great job, was professional and efficient.
phuong N.
1713978362
Jose Rivera did a super job. He even added tape to protect the insulation from the elements
Gigi M.
1713920881
Extremely helpful and knowledgeable!David and Juan were very helpful!
Pamela J.
1713918044
Anthony Manzo and Brett Turner gave me great service and excellent recommendations. They made sure I understood everything. Thanks!
Joe L.
1713901725
James H. and David E. Serviced our unit on a bi annual maintenance and did excellent job. I highly recommend this program and James and David to do the work.
Brett H.
1713901322
Kevin and Steven were great
Joshua G.
1713897697
4/23/24 - Daniel B. and Juan De Jesus came out to do maintenance on my system! They were great - on time, professional and knowledgeable!
Marie A.
1713897310
Spencer and Kyle were my technicians and they did a great job. They were thorough and friendly and explained what they were doing as they went along. Overall great experience, wish all service techs operated this way!Update: Ivan and Angel came to do our follow-up service call. Same experience. Friendly, fast, and efficient. I really appreciate the consistency of service with this company
Joseph H.
1713897054
Marco and Ashton are very courteous, friendly, and professional. They are very knowledgeable, and expertly performed their inspection on my heating and air conditioning system. Marco even went above and beyond, and installed a fix for my thermostat on the spot at no charge. I highly recommend Marco, Ashton and the Brody Pennell team!
Jennifer M.
1713896132
The "comfort club" is well worth the annual fee. Our system is checked and cleaned twice annually, and the staff have been superb.
Abeigel B.
1713834446
Outstanding in every way , technically, courtesecy, helpful. Perfect.
Diane S.
1713827710
Great service and Rene was helpful and professional!
Dr. Jack W.
1713824178
Daniel B is an exemplary employee of BP..Truly an excellent Tech whom we appreciated performing our system’s maintenance!!Thank you, Daniel !!
Preston M.
1713821826
After wasting money and time with another company, David M. And Brett T. came out and help me fully understand the issues with my AC unit and provide no nonsense pricing. Highly recommended.
Connie S.
1713815315
Leo H and Tristen were great and thorough
Roy B.
1713811085
Anthony ManzoDaniel Avila
Sandi M.
1713810372
A representative of Broudy Pernell came to my home to assess a new HVAC system & adding AC. It was very informative. He explained the benefits of switching from a furnace based system & to a heat pump system. With all this new information I am deliberating making the change.
Stephen C.
1713807095
Service was good. Responsive. Rene was able to demonstrate where the problem was at. Good listener.
Kelly F.
1713735345
Cesar was excellent and went the extra mile to complete our service as well as talk about future maintenance.
Brian J.
1713724611
Great Company Great service. Nathan C and Jose A were amazing installers and Spencer took great care of us as well. 5 Star Service!
William D.
1713644033
04/19/24 Rene and Brett once again came through and was fast and knowledgeable. Never using anyone else!Bret and Rene were great. Service was amazing and very helpful! Got a heater installed the next day.
Joy C.
1713579080
Great service
Tiffany G.
1713570083
Absolutely wonderful work! Highly recommend requesting: Jose Rivera, Pablo Pluma, and Omar Molina!!! Their expertise really came through the work they did on our AC and heating unit. They fixed issues with a prior installation and talked us through all the changes they were making. They were also polite and super clean. Cannot sing their praises enough!
Steve M.
1713569663
Jose, Pablo and Omar did a fantastic job on the reinstallation of our new HVAC system.
Lars S.
1713568412
James H of Brody Pennell provided professional servicing of my A/C and humidifier. I would recommend him highly.
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stephanie C.
1714102943
Jose Rivera came to replace Thermostat on a newly installed system. He explained the whole process very well. It was an exceptional and spotless installment, would definitely recommend to family and friends. He deserves 5 stars, will have him working with us again.
Brian K.
1714095576
Great, friendly, knowledgeable, and professional service! Enrique, Danny and Nathan did an excellent job of duct cleaning our hvac system. They were polite, professional and very friendly.
Marcia W.
1714093751
Tony M and Jose were both here for our 6 month checkup and they were extremely thorough, explained everything, and very nice. Would highly recommend them.
Steve L.
1714085783
Tristen and Juancho were efficient and friendly and explained everything clearly.
Debra M.
1714085316
Excellent service by Juan Munoz, Daniel Picard, Brian Diaz, and Juan Sanchez. Very helpful in explaining the HVAC installation process and helping set up new thermostat. Extremely kind and helpful. I recommend Brody Pennel for any HVAC installation or repair.
S O
1714085187
Maria was pleasant and did an excellent job. Explained everything very clearly. Very happy with the service.
Eva B.
1714084317
JuanMolina serviced my ac and heating today He was very polite and helpful,
Tony G.
1714083874
Our regular semi-annual service was performed today and Rene, our technician, did a terrific job, showing care and attention to detail. He's very friendly and informative and made sure we had all our questions answered and were completely satisfied.
Shari M.
1714082673
Marco is the best!!!!
Liza U.
1714081448
Kevin and David E were great4/25/24 Juan C and Gio Q were awesome and helped in everyway. Thanks guys
S M
1714078921
Daniel B & Jose CWe're very polite and courteous and worked very proficiently and efficiently and were able to inform us of the exact problem which was great. I would not hesitate to call on these guys for HV assurance. Thanks Daniel & JoseOn 4/25/2024 Daniel B & Jason S provide our company with best care that we find truly impeccable and would recommend this company and these workers to any other establishment and wouldn't want anyone but the best and these guys are the best in our opinion.
beatles341
1714077166
Jose C. was a great technician to work with. Excellent customer support and service.Ivan D and Kevin L are great guys. They did the maintenance for my property around a month ago. 4/25/24
brett H.
1714076214
My technicians did a great Job ! Steven and Leo.H I would definitely use them again and recommend them.
peter B.
1714076196
Kevin L. and Ivan D. were great and outstanding technicians, efficient, thourough, and wonderful. Please send them back again.
Norman M.
1714074725
Armando and Richie completed a comprehensive inspection and cleaning of my HVAC system. They were thorough and professional, and courteous .I am pleased with their work. Thanks Brody-P.
gloria R.
1714070730
Juan Romo was amazing super knowledgeable and friendly!!!! Amazing service
Helen S.
1714006075
I’ve been with Brody Pennell for many years, and I’m very happy with their service. James Handy is particularly amazing, and I was very fortunate to have him on my most recent maintenance services. He gave me great advice and did a fantastic job.
Denise H.
1714001375
Steven was great!
Kathy N.
1714000925
Juan Romo checked my heater in great detail today and gave me a full report on its welfare. He has suggested the repair of the heat exchanger due to wear and tear . He also pointed out a problem with the circuit board and one small section. He was very thorough, and I understood exactly what he was saying. I commend him highly! Kathy Naylor
Josh E.
1713989240
Juan Molina: thorough, neat, informative & pleasant.
david C.
1713988327
anthony manzo and armando n . great job efficient
Margarita C.
1713984415
Excellent job by Rene Morales 10 stars.
Ana A.
1713981385
Amazing service, very nice attitude, Leo H, Ruben M and Ivan D have extraordinary customer service
David S.
1713979878
Had Jason come by to add surge protector and he did a great job, was professional and efficient.
phuong N.
1713978362
Jose Rivera did a super job. He even added tape to protect the insulation from the elements
Gigi M.
1713920881
Extremely helpful and knowledgeable!David and Juan were very helpful!
Pamela J.
1713918044
Anthony Manzo and Brett Turner gave me great service and excellent recommendations. They made sure I understood everything. Thanks!
Joe L.
1713901725
James H. and David E. Serviced our unit on a bi annual maintenance and did excellent job. I highly recommend this program and James and David to do the work.
Brett H.
1713901322
Kevin and Steven were great
Joshua G.
1713897697
4/23/24 - Daniel B. and Juan De Jesus came out to do maintenance on my system! They were great - on time, professional and knowledgeable!
Marie A.
1713897310
Spencer and Kyle were my technicians and they did a great job. They were thorough and friendly and explained what they were doing as they went along. Overall great experience, wish all service techs operated this way!Update: Ivan and Angel came to do our follow-up service call. Same experience. Friendly, fast, and efficient. I really appreciate the consistency of service with this company
Joseph H.
1713897054
Marco and Ashton are very courteous, friendly, and professional. They are very knowledgeable, and expertly performed their inspection on my heating and air conditioning system. Marco even went above and beyond, and installed a fix for my thermostat on the spot at no charge. I highly recommend Marco, Ashton and the Brody Pennell team!
Jennifer M.
1713896132
The "comfort club" is well worth the annual fee. Our system is checked and cleaned twice annually, and the staff have been superb.
Abeigel B.
1713834446
Outstanding in every way , technically, courtesecy, helpful. Perfect.
Diane S.
1713827710
Great service and Rene was helpful and professional!
Dr. Jack W.
1713824178
Daniel B is an exemplary employee of BP..Truly an excellent Tech whom we appreciated performing our system’s maintenance!!Thank you, Daniel !!
Preston M.
1713821826
After wasting money and time with another company, David M. And Brett T. came out and help me fully understand the issues with my AC unit and provide no nonsense pricing. Highly recommended.
Connie S.
1713815315
Leo H and Tristen were great and thorough
Roy B.
1713811085
Anthony ManzoDaniel Avila
Sandi M.
1713810372
A representative of Broudy Pernell came to my home to assess a new HVAC system & adding AC. It was very informative. He explained the benefits of switching from a furnace based system & to a heat pump system. With all this new information I am deliberating making the change.
Stephen C.
1713807095
Service was good. Responsive. Rene was able to demonstrate where the problem was at. Good listener.
Kelly F.
1713735345
Cesar was excellent and went the extra mile to complete our service as well as talk about future maintenance.
Brian J.
1713724611
Great Company Great service. Nathan C and Jose A were amazing installers and Spencer took great care of us as well. 5 Star Service!
William D.
1713644033
04/19/24 Rene and Brett once again came through and was fast and knowledgeable. Never using anyone else!Bret and Rene were great. Service was amazing and very helpful! Got a heater installed the next day.
Joy C.
1713579080
Great service
Tiffany G.
1713570083
Absolutely wonderful work! Highly recommend requesting: Jose Rivera, Pablo Pluma, and Omar Molina!!! Their expertise really came through the work they did on our AC and heating unit. They fixed issues with a prior installation and talked us through all the changes they were making. They were also polite and super clean. Cannot sing their praises enough!
Steve M.
1713569663
Jose, Pablo and Omar did a fantastic job on the reinstallation of our new HVAC system.
Lars S.
1713568412
James H of Brody Pennell provided professional servicing of my A/C and humidifier. I would recommend him highly.
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