It is hard to imagine an invention that does more to improve our quality of life than our HVAC systems. Every year, people spend more than $120 billion in the United States industry for heating and air conditioning contractors. On top of that, there are more than 118,000 separate businesses offering HVAC services around the country!

Many people wonder when they should call HVAC experts to repair their systems. HVAC system noises sometimes reveal significant underlying problems. But in other cases, you can ignore them and they will take care of themselves.

So what exactly is causing your HVAC system noises? Do you need to call the professionals? Read on to learn all about the most important things to understand about the noises that your HVAC system makes!

Screeching Sounds

One of the more concerning sounds you might hear coming from your HVAC system is a high-pitched screech. This screeching or HVAC squealing sound may indicate that your fan belt is not functioning properly anymore.

It’s also possible that your motor simply lacks lubricant. Without proper lubricant, the mechanisms inside your HVAC system will rub up against each other roughly, creating a screeching sound.

In either case, you will probably want to call HVAC professionals. It takes a special kind of lubricant to lubricate the motor in an HVAC system. And if you do have a fan belt that is no longer functioning, you will need the experts to install a new one for you.

Rattling Sounds

Sometimes, HVAC systems start making rattling sounds. Over time, these rattling sounds can either calm down or progress to banging sounds.

Rattling sounds indicate that there is something loose in your HVAC system. In most cases, the problem will progressively get worse, requiring you to call someone to help you repair it.

You can especially tell that the problem is getting worse if it starts getting louder and turns into a banging sound. If your problem gets that bad, you should probably turn off your HVAC system. Otherwise, the loose piece that is banging around could cause more damage to your system.

If at all possible, you may also want to call for expert help when you hear a rattling sound. Just because you can wait a while does not mean that you should. Even that rattling sound can indicate that a loose piece is bumping up against other mechanisms in your HVAC system and causing further damage.

Popping Sounds

There are a couple of different popping sounds you might hear coming from your HVAC system. One of the most common popping sounds comes from your air vents. Your ducts are probably made of a lightweight metal that contracts and expands with the temperature.

As you heat up cold vents, they will expand, causing a popping sound. Fortunately, this is not a real problem. You do not need to call for anybody to repair anything, because nothing is broken.

On the other hand, you might hear HVAC system noises like popping coming from other parts of your unit. If you hear popping that is not coming from the vents then it is possible that you will need to call for expert help.

Buzzing Sounds

There are a few different potential causes of HVAC buzzing sounds. If you are hearing an electrical buzzing sound, it is a very serious issue. You should shut off your system, call for help, and keep an eye out for potential fire hazards.

On the other hand, the buzzing might be the result of a leak in your HVAC system. Your compressor might also not be working correctly.

In these cases, your situation is probably not as urgent. However, you should still probably call for expert help.

Clicking Sounds

Some clicking sounds are perfectly harmless. If you are starting up your furnace for the first time in a while, it might make some clicking sounds. These do not indicate that anything is wrong.

However, if you hear a clicking sound coming from your air conditioning, you might have a problem with your compressor. In that case, you will want to call for an HVAC technician to help you.

Hissing Sounds

A hissing sound may also indicate excessive refrigerant pressure in your air conditioning. You should call for professionals to help you.

If you hear a hissing sound coming from your heating system instead, you probably have a leaking vent. That will make your HVAC system less efficient. You should call the professionals to improve your efficiency, but you do not have to worry about serious danger.