What’s That Noise? 6 HVAC Noises You Shouldn’t Ignore

Posted - June 6, 2018
A man listening to a noise in his home

If you’ve lived with your heating and cooling system for a year or more, you know all of the noises it makes during normal operation in your Carrollton, Texas, home. But what should you do if your heating and cooling system start making strange or scary sounds? Discover six HVAC noises you shouldn’t ignore and find out what to do when you hear these startling sounds.

AC Hissing Sounds

If your air conditioner or heat pump is like most, it produces a gentle hum as it turns on and gets to work cooling your home. When that quiet hum turns into a nasty hiss, however, your cooling system could be alerting you to a serious problem.

In many cases, hissing comes from your HVAC system’s ductwork, signaling that a large amount of air is leaking. While a small amount of air leakage is normal, a major leak means the ductwork may have a large crack, which can lead to substantial energy loss and expensive HVAC performance issues down the road.

In other cases, hissing can result from a refrigerant leak. Since this can also compromise HVAC performance, we never recommend addressing the problem on your own. Rather than investigating the source of a hissing issue yourself, we always suggest calling the Advanced Home Comfort team for a professional solution.

AC Clicking Noise

Most HVAC systems make a single clicking noise when they turn on or switch off. While an isolated click isn’t caused for concern, a series of clicks can indicate trouble.

If you hear your heating and cooling system clicking repeatedly, consider it a sign that an electrical component is faulty. Since you should never address electrical issues yourself, we always recommend calling our AC repair technicians. Our skilled team will let you know whether a simple fix will get your HVAC system up and running again or whether it’s time to start thinking about an air conditioner replacement.

Banging or Clunking Noises

Banging and clunking noises often indicate that an HVAC part has become loose and has begun moving around freely. Usually, the motor or blower is the culprit, but you can’t be certain without a professional inspection.

Since banging and clunking noises tend to get worse, it’s best to turn off your HVAC system and call our team for repairs. We’ll get to the source of the problem right away and determine how to fix it quickly and effectively.

AC Vibrating Noise

Vibrations and related noises coming from your HVAC system might not seem serious, but we don’t recommend ignoring them. They could be the result of a loose part creating pressure on a key component of your heating and cooling system, and both the noise and the impact could worsen over time.

When you hear a vibrating noise coming from your heating and cooling system, calling for HVAC maintenance is a smart idea. Performing a tuneup and inspection allows our heating and cooling technicians to identify any parts that need tightening before they become completely detached and cause serious damage.

AC Buzzing Sounds

A long list of issues can cause buzzing sounds, from loose wiring to unbalanced fan blades to debris in your HVAC system. In some cases, a buzzing noise simply indicates that you need to replace the air filter, while in other cases, your HVAC system may need a complete tuneup. Buzzing sounds aren’t always easy to diagnose without an inspection, which is why calling for professional maintenance is essential.

AC Screeching Noise

Screeching sounds are some of the toughest noises to ignore, and they often signal serious issues with your HVAC system. If you hear a screeching noise from the moment your air conditioner starts until the second it switches off, it probably needs a new motor. If you only hear the noise at startup, the compressor could be to blame. Either way, Advanced Home Comfort recommends calling for professional HVAC service before continuing to run your cooling system.

Don’t let minor heating and cooling issues turn into major HVAC problems. Reach out to us today for all your HVAC repair and replacement needs.