Why is my air conditioner so loud?

Is Your Air Conditioner Making Strange Noises? Here’s What They Mean

A loud air conditioner is never a good sign. While some humming is normal, if your A/C is making clunking, rattling, or grinding sounds, it’s likely not working properly.

A malfunctioning air conditioner is either working too hard, causing your energy bill to skyrocket, or not running efficiently, leaving your home hot and uncomfortable. Neither situation is ideal, so let’s play a game of "Name That Sound" to help diagnose the issue!

What’s Causing That A/C Noise?

Harsh Rattling or Humming

Possible Cause: A fan issue inside the unit.

✔️ Check for debris that may have fallen inside.
✔️ Inspect the fan blades, they should be clean and straight.
✔️ If the fan is loose, tighten it to prevent further damage.

Humming or Grinding

Possible Cause: A dry motor that needs lubrication.

✔️ Apply a little oil to the motor at the start of every summer to prevent wear and tear.
✔️ If the noise persists, a professional inspection may be needed.

Rattling or Vibrating

Possible Cause: Loose screws or panels from normal A/C vibrations.

✔️ Over time, vibrations loosen screws inside the unit.
✔️ Tighten all screws and panels to eliminate the noise.

Loud Humming Like a Freight Train

Possible Cause: Dirty or bent coil fins inside the unit.

✔️ Dirty or misshapen coil fins can cause an intense humming noise.
✔️ Clean the coil fins and straighten any bent sections to restore quiet operation.

Don’t Let a Loud A/C Drive You Crazy!

A properly functioning air conditioner should run quietly and efficiently. If your A/C is making unusual noises, don’t ignore it, doing so could lead to higher energy bills, costly repairs, or even system failure.

Let a professional HVAC technician at Finken diagnose the problem! Visit our Contact Page to schedule a service today.