How Dangerous Are These Sounds Your AC Is Making?

August 21, 2017

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Air conditioning is an amazing luxury, especially while we are trying to beat this Houston heat. But when your AC system starts making weird noises, it can be hard to keep your cool. At Superior HVAC, your comfort and happiness are our priority. We would hate to spend a second without air conditioning in our own homes, but we would hate it even more if one of our loyal customers had to do without cool, circulating air this summer. That being said, we want to provide you with the proper tools to diagnose a problem with your AC unit, should it start making funny noises. What sound is it making and what might that mean–we’ll help you get to the root of the issue. And if you realize you need further assistance, we look forward to answering any questions you may have or helping you schedule a time for us to come out and repair or replace your air conditioning unit.

So what sound is your AC making?


If your air conditioning system is making clanking sounds, there are a couple of different things that may be going on within your unit. There may be a part that is loose, out of balance or that has completely fallen off and is now bouncing around inside the unit making an annoying and troublesome clanking noise. If the part that’s loose is the compressor, this might require repair or replacement that we are highly qualified to take care of for you! A clanking sound may also mean the the fan’s blades are bent or out of balance and are hitting other parts within the unit. More than likely, it will be difficult to ignore the clanking sound within your AC unit, but if you are somehow able to tune it out, don’t tune out the fact that you will need to have this issue repaired as soon as possible. If you go without calling Superior HVAC, the problem with your air conditioner will only get worse and you may eventually need to have your full system replaced—we can also take care of a full AC replacement, if need be!


When it comes to buzzing sounds resonating from your air conditioner, there are several things this sound could mean, including:

  • Refrigerant leaks
  • Debris or water in the unit
  • Fan motor is loose
  • Loose parts
  • Blower is failing or out of balance
  • Fan blades are loose
  • Air filter needs to be changed
  • Condenser coil needs to be changed

Finding the cause of the buzzing sound may be difficult on your own, which is why we recommend giving us a call. We will be able to quickly diagnose the problem and have it resolved immediately. You will be back enjoying cool, circulating air in no time—and without any annoying buzzing sounds!


A humming sound coming from your AC unit may not be the result of a serious problem—sometimes it may even be difficult to differentiate a “problematic” humming sound from the normal humming your system makes. This sound typically points to an electrical issue like problems with the motor including loose wiring. Loose parts and refrigerant piping can all vibrate within your air conditioning unit causing the humming sound, as well. Again, it may be difficult to get to the root of your problem on your own, so please give us a call when you need some assistance. And don’t forget, as with most HVAC issues, even a small problem that seems insignificant can eventually turn into a large issue if ignored.


You may notice a clicking sound when you turn your AC unit on or off, and this type of clicking sound is normal. If, however, you consistently notice a clicking sound while the air conditioner is running, this could point to issues with the thermostat. The thermostat senses the air temperature in the room and automatically switches your system on or off when your desired temperature is reached. Beyond the clicking sound in your air conditioner, other ways you can tell the thermostat has failed include:

  • Air conditioning runs constantly, never turning off
  • Air conditioner refuses to start
  • Temperatures vary from room to room
  • Changing the batteries does not resolve the issue

If you think your thermostat has failed or is failing, give our HVAC experts a call today. Whether you are hearing a clicking sound coming from within your AC system or your air conditioning is running without stopping, our team will be able to diagnose the problem and resolve it immediately.


Most of the time, a rattling sound coming from your AC is caused by loose parts that are bouncing around or debris that has clogged the system. If the fan is loose, this may also be the culprit, as a loose fan will rattle violently and can even knock into other parts within the unit—this is a dangerous problem that should be resolved immediately. If you are set on checking out and finding the cause of the rattling sound on your own, start your search looking for loose screws and then change your indoor air filter. If the sound persists, give us a call. We want you to stay cool and comfortable during this Houston heat!

High-Pitched Whistling

Never ever ignore a high-pitched whistling sound coming from your air conditioner! If you hear this sound, turn your AC unit off immediately and get the professionals at Superior HVAC on the phone right away. A whistling or screaming sound can be an indicator that your system is leaking refrigerant. Not only does a refrigerant leak cause damage to your AC unit, it can also cause serious, serious health issues for you and your family. When people inhale refrigerant, which is a tasteless, odorless gas, problems such as troubled breathing, fluid buildup in the lungs, organ damage and even death. Why does this happen? In short, refrigerant cuts off the supply of oxygen to your cells and lungs. If you are worried that someone in your family is experiencing refrigerant poisoning, call 911 or the National Poison Control Hotline (1-800-222-1222).

If you notice a whistling sound and are able to turn off your air conditioning unit before any real issues arise, call us right away. We will hurry to your home to fix the problem, ensuring your family is safe and that your AC is working properly. We offer same-day service calls, so you will never have to wait to have an immediate issue resolved by our professionals.


A squealing or screeching sound coming from your air conditioner usually means you have a broken or damaged belt. A belt needs to be repaired by an HVAC professional and is, of course, another problem we will be able to quickly and easily resolve for you. The belt is what enables the fan within your AC unit to spin properly. Belt-powered fans are typically found in older AC units, so if the belt in your system fails, you may consider replacing your old air conditioner with a new, more efficient unit—it’s completely up to you, but we recommend upgrading your current system.


Bubbling sounds are very troublesome and dangerous and are early warning signs of a slow refrigerant leak. Turn off your AC system immediately and call Superior HVAC. The bubbling sound comes from gas bubbles that are moving through the refrigerant line. If this sound goes ignored, it will turn into a full blown leak, which, like we explained, is a serious health hazard and can even be fatal. So don’t delay when you hear bubbling noises—call us right away!

Any Other Weird Or Strange Sound

If you notice any other abnormal sound coming from your AC unit, give our team a call today! Because of the serious problems that could be happening within your unit, we recommend calling right away when you notice a sound that is out of the ordinary. When you call us, we’ll be able to arrange your free estimate and even get out to your house, same day, if your HVAC problem needs immediate attention. We are currently offering a special on AC replacement that includes a free Wi-Fi thermostat with installation. If you are someone who has an old, out-of-date AC system, take advantage of this special today!

At Superior HVAC, we are proud supporters of the Wounded Warrior Project. We donate a large portion of our service fees, installation fees and repair invoices to this incredible project. Read more here to learn about our specials and the exact amount of money we donate to the WWP. We know there are many other HVAC companies that you can turn to when you are in need of repair or replacement services, which is why we appreciate your business and look forward to working with you soon.

*Disclaimer: All Promotional offers are for retail customers only and can not be redeemed when working with your home warranty company.
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