Your air conditioner is one of the most important appliances in your home during the warmer months, but it’s also one of the easiest to overlook until something goes wrong. While some signs of trouble are obvious (like warm air blowing when it shouldn’t), others are more subtle. Strange or unfamiliar noises coming from your AC system are one of the clearest indicators that it’s time to call in a professional. Here’s a guide to the most common sounds your AC might make, and what they could mean.
1. Banging or Clanking
Loud banging noises are usually a sign that something has come loose inside the unit, often a broken or unbalanced component like a connecting rod, crankshaft, or even the blower assembly. If left unaddressed, these loose parts can cause further internal damage. Clanking sounds, similarly, often point to parts that are out of alignment. Either way, if you hear these metallic noises, shut off your unit and call a technician before the issue escalates.
2. Buzzing
A persistent buzzing noise could be electrical in nature, potentially pointing to a failing motor, loose wiring, or issues with the capacitor. It might also indicate that debris has entered the outdoor unit or that the condenser coils need cleaning. While a buzzing AC may still be running, it’s only a matter of time before it stops. It’s best to address the root cause early to prevent a complete breakdown.
3. Screeching or Squealing
If you hear a high-pitched screech or squeal when your system starts up or runs, it could mean a worn-out or slipping fan belt, or problems with the motor bearings. This type of sound is more common in older units that still use belt-driven systems. While not necessarily dangerous, it’s an early warning that something needs replacing—and soon. Continuing to run the unit in this state could lead to more extensive damage.
4. Clicking
Clicking sounds at startup and shutdown are normal. However, constant or irregular clicking noises may be a sign of a faulty thermostat or a failing electrical component, such as a relay. If the clicking continues without the AC starting, or if it happens throughout the cooling cycle, it’s worth having a technician inspect the system before the issue becomes more serious.
5. Hissing or Bubbling
These sounds often point to refrigerant leaks. Hissing may come from high pressure in the compressor or escaping gas from a small hole, while bubbling could indicate a leak in the refrigerant line. Either way, a loss of refrigerant can severely impact your AC’s performance and efficiency, and may even damage the compressor if not resolved.
When to Take Action
Strange noises aren’t just an annoyance—they’re a warning signal. Ignoring them can result in reduced efficiency, higher utility bills, and in some cases, irreversible damage. If your air conditioner is suddenly louder than usual, or is making any of the sounds described above, it’s time to schedule a professional inspection.
Your AC might not be able to speak, but it knows how to cry out for help. Listening to the noises of imminent repair can save you time, money, and a lot of discomfort in the heat.
Contact Comfort Tech Heating & Cooling for prompt and reliable AC repairs.