8 HVAC Noises You Shouldn’t Ignore

HVAC Tips from Dave's Mechanical
The heating, ventilation, and air conditioning (HVAC) is the hub of your home. When it is working great, everyone is happy. But what happens when you hear HVAC Noises you should get them checked out immediately! 

Below, we identify certain sounds that will set off mental alarms when you hear them and prompt you to schedule a service, call right away.

  1. Hissing – If your unit hisses, especially when it isn’t running, it may mean you have a leaky refrigerant line, an internal valve leak, or the compressor’s pressure is too high.
  2. Clicking – If your unit is clicking constantly or more than at start up and shut down, it could mean there are electrical control issues. The clicking might be caused by a defective relay or a problem with the thermostat.
  3. Banging, thumping and rattling – These sounds are usually an indicator of something coming loose in the motor or blower. If the banging gets loud, it probably means that whatever was loose has now broken off.
  4. Humming or vibrating – This could mean that there are loose parts, or the motor is out of balance. The louder the sound, the greater the need to get it checked out. Humming could mean that you have a bad motor, or your compressor is straining.
  5. Buzzing – This could mean a number of things that could be wrong, including loose parts, debris, a loose fan motor, the air filter needs to be changed, or there is a refrigerant leak.
  6. Squealing or screeching – This could be a sign of a failing component, like motor issues, including motor bearing problems or a bad belt. If you have a bad belt, it could break, resulting in your blower coming to a screeching halt. This could potentially cause more damage, so it is important to get it checked out before the belt breaks.
  7. Grinding – This could mean there is a problem with the compressor. As the unit starts to fail, the pistons can cause this sound.
  8. NEW noises – If your unit is normally quiet and suddenly starts emitting sounds, you should call an HVAC professional right away.

Where to Turn for Help For HVAC Noises 

Finding a quality technician is important when you need your equipment serviced. If you wait too long to address any new sounds, it could result in damage to your system, which as previously stated, will cost you more money to fix. Dave’s Cooling & Heating provides high quality, professional service. Dave’s is an award-winning HVAC company which can provide plumbing services, as well as any maintenance, repair or installation of an HVAC system. You want someone you can trust that will accurately diagnose any problems and maintain your equipment properly.


The importance of maintaining your system and equipment cannot be understated. Making sure the complicated equipment that supplies your heating, ventilation, and air conditioning is operating at its highest performance is key.  A maintenance plan can help reduce the number of unexpected problems. It also provides you with the comfort that your system is running the way it should. Maintenance plans can result in the following:

  • Decreased utility bills – When your system runs properly, it is more efficient.
  • Fewer repairs – Keeping up with maintenance can find small problems and address them before they become big problems.
  • Reduced instances of catastrophic failures – System inspections help reduce the possibility of this kind of devastation.
  • Increased equipment life – Having your equipment maintained will help it last longer. By making sure everything is running as it should, thus increasing its life.
  • Safer operation of equipment – People can be affected physically if a system is not working properly. For instance, a broken system can result in carbon monoxide leaking into the home. This can have catastrophic results, including hospitalization and death. You need to make sure all the components are in proper working order, so you do not experience events like this.

While it is important to get your system checked out by a professional, there are things you can do. For example, changing filters and making sure it is clear around your unit. These things will help reduce potential problems and will help extend the life of your HVAC unit.

For help with fixing HVAC noises contact us today at (301) 401-2780 or click here! 

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