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What a Humming Air Conditioner is Trying to Tell YouNormally, a properly functioning air conditioner makes occasional pops, hisses, rattles, and a quiet hum that shouldn't be a cause for concern. However, if you notice a loud humming or buzzing noise, your unit is probably malfunctioning. Several issues can cause a humming air conditioner. Let's take a closer look at them along with their solutions.

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HVAC system , air conditioner , air conditioning , a/c problems , HVAC problems , HVAC unit , humming

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"I appreciate my technician Dalton. He is very thorough and takes really good care of my HVAC. He is also very patient and kind. Thank you Dalton!"

Patty Barnes
(Google Review)

★ ★ ★ ★ ★

"Hartman Brothers service technicians are always very prompt, professional and knowledgeable. Excellent products and service."

Bill F.
(Google Review)

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"I had an excellent experience with Hartman Brothers from start to finish. After dealing with an incomplete and frustrating repair from Peterman Brothers, Hartman Brothers was a breath of fresh air. Their technician spent several hours thoroughly troubleshooting my tankless water heater, walking through the issues clearly and professionally. There was no upselling, no pressure, and no shortcuts—just honest, methodical work. Based on their findings, I chose to upgrade to a new tankless water heater, and the decision was entirely mine. At no point did they try to push a sale or steer me toward anything unnecessary. The installation was clean, the communication was excellent, and the entire process felt transparent and trustworthy. It’s clear why they have such a strong reputation in the Fort Wayne area. Their professionalism, responsiveness, and genuine customer‑first approach really stand out. I’m very happy with the new system and with the service I received. "

Cory T.
(Google Review)

★ ★ ★ ★ ★

"Extremely pleased with their work! When I say I'm a picky customer, I really mean it (I'm a Training Manager for an HVAC manufacturer). These guys showed up precisely on time, were extremely courteous and professional, and did an outstanding job on my system. They were very careful moving the equipment to my mechanical room (not an easy task), did a very neat job on the install, and cleaned up so that everything was spotless when they left. I even gave them an opportunity to do a "shortcut" on my install, but they refused and said "that's not the way we do it." It was easy to tell that these techs took PRIDE in the work they were doing. I can't even begin to tell you how much I would recommend this small business from New Haven, IN to do any HVAC work. If you want a courteous, professional install at a reasonable price, call Hartman Bros!"

Jay Hammond
(Google Review)

★ ★ ★ ★ ★

"Dad called for service and Hartman’s were there just a couple of hours later, found the problem and replaced the part. I can’t say enough about their exceptional service and techs! We have used them for years and can always count on them to come through."

Jill C.
(Facebook Review)

★ ★ ★ ★ ★

"Prompt service and response time. Job was too tricky for me to handle myself and, as expected, my technician handled it like a pro."

Matt N.
(Google Review)

★ ★ ★ ★ ★

"Arrived on time and work completed in a professional way. Would highly recommend Hartman’s."

Bob B.
(Google Review)

★ ★ ★ ★ ★

"I had just called in yesterday for a non-emergency plumbing repair and they were out first thing this morning! Brad was very professional and courteous and he got everything taken care of very promptly. He had to go get a part and was back faster than I thought he could be. Great job and I will call again for my plumbing as well as my HVAC needs."

Roger D.
(Google Review)

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