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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 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)

★ ★ ★ ★ ★

"Service manager made room in the schedule for warranty work, it was very much appreciated and the service tech Caleb was awesome. We are new to the area and will be using this company. Great job!!"

— John W.
(Google Review)

★ ★ ★ ★ ★

"Luckily I have only had to use them twice in the last 15 years or so but their service techs are always super friendly, the people that answer the phone are always friendly, great culture."

— James K.
(Google Review)

★ ★ ★ ★ ★

"Wonderful customer service!! Tech is absolutely professional and kind. He went above and beyond by bringing my trash can into my garage. Awesome service!"

— Kim S.
(Google Review)

★ ★ ★ ★ ★

"Called and they came out same day,…and it was day after Thanksgiving. Service man was very informative and thorough. Definitely recommend Hartman and we plan to use them for maintenance and future furnace or ac needs."

— Traci N.
(Google Review)

★ ★ ★ ★ ★

"Caleb was very courteous and thorough on his routine check-up of our heating system. Thank you."

— Ron N.
(Google Review)

★ ★ ★ ★ ★

"I've used Hartman Brothers for all my HVAC needs across multiple properties and they are always responsive and timely. Dalton was my technician and demonstrated a high degree of both professionalism and helpfulness. Vicky is their jack-of-all trades office and scheduling manager. She always does a phenomenal job and makes you feel valued as a customer in every interaction. You can't go wrong with this company. Strongly recommended!"

— Spencer Lulling
(Google Review)

★ ★ ★ ★ ★

"Had our a/c quit functioning over the weekend. Called first thing Monday and they were able to get someone out in the morning and had us back up and running before we knew it!! Great service experience from initial phone call to completion of the job couldnt be happier!!"

— Bud Brewer
(Google Review)

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