What Noise is That? 8 Common HVAC Noises Explained

Any HVAC equipment, regardless of age or cost, tends to produce loud sounds after a certain point. You might have gotten used to the quiet hum of your HVAC equipment, but it’s important to be aware of any new noises.

What Noise is That? 8 Common HVAC Noises Explained

It goes without saying that not every sound emanating from your system implies you’re on the verge of disaster. That said, for better or worse the majority of HVAC noises signify that the time for repair or maintenance has arrived. The following are a few examples of these sounds, along with some useful ideas for eliminating them.

1. Click, click, click

When you switch on the heat for the first time in the fall and winter, clicking sounds should definitely not worry you, as it’s simply indicating that your system is up and running. If your system is already turned on and you hear nothing but clicking, there may be an issue.

2. Rattling

The most typical source of rattling noises is loose objects, such as screws. Even a little jingling of a tiny screw over time might lead to massive difficulties in the future. Debris that makes a louder noise than normal, or scraping, should be addressed. You may locate the source of the noise by using a magnet and unscrewing the vent to check for debris. If that doesn’t work, seek the help of a specialist to discover the source of the problem. If your main panel or outside compressor is making a continuous clicking sound, it’s probable that a relay has failed. Our advice, in this case, is to keep an eye on the clicking rate and then seek help from an HVAC expert once you’ve identified a pattern.

3. Squealing and screeching

It’s most likely a faulty belt or motor bearing if all you get is continuous squealing or screeching after your HVAC system has started. If the noise is minor, clean the belt with lubricant. If this doesn’t work, or in case the noise becomes louder than usual, you should consult an expert. At least we know that a faulty air or fuel filter replacement isn’t particularly expensive. However, if either part is not fixed, it might break, which may cause your system to fail and necessitate costly repairs.

4. Rumbling

Is your unit making rumbling noises? Then, there’s a good chance that there’s an issue with one of your burners. As your heating system generates heat, soot, dirt, and grime collect on the burners. The particles build up and cause the rattling. If you decide to clean the burners, switch off the gas and electricity first. Then, using a vacuum cleaner, thoroughly clean any dust from or around your burners, the base of your furnace, or the blower compartment.

5. Hissing noises

There are two types of HVAC hissing: annoying and hazardous. The best part is that we’re 99% sure there isn’t a snake in your heating and cooling system. The not-so-good news is that the source of the hissing is most likely because your ductwork is letting air out. Leaks in ductwork can cause your system to work harder and require more repairs, and they may lead to more maintenance. Leaks in your ductwork can produce a poor quality of air, causing restricted breathing and cold and hot spots, as well as clogged filters. Because working in your ducts entails a high degree of accuracy, we strongly advise that you get the help of a professional to address the problem.

6. Banging, Clanking or Thumping

If you’re hearing banging, clanking, or thumping, there could be trouble on the horizon. If any of these annoying noises are originating from your HVAC system, there’s a problem with the blower assembly. Before the condition gets worse, we recommend shutting off your HVAC system and calling a professional to look at the situation.

7. Popping

Truth is, if you hear popping noises when you switch on and off your system, you can relax. The popping sound is caused by your metal ductwork expanding and isn’t harmful to your equipment. If the noise is driving you insane, fiber such as foam or rubber may assist reduce the racket.

8. Buzzing sounds

The humming noise emanating from your heat pump or cooling unit is caused by vibration. Make sure that there aren’t any faulty components and, if necessary, tighten any that are loose. If it’s still buzzing, it might be due to your unit’s mechanical parts, which is generally a sign that it’s time to replace it.

If you have a problem with your air conditioning unit, locate an expert HVAC professional and call them right away. They will be able to examine the motor in your device and tell you whether it can be fixed or if it must be replaced.

Get in touch with our team

Here at Baylor Inc. we’ve been in the heating and cooling business for many years in a row, and we’re ready to assist with any home comfort issue that may come your way. Call our team today to ask questions, receive advice or schedule an appointment.

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