AC Making Loud Noise

Professional AC Making Loud Noise in Asheville & Western NC

When your air conditioner starts producing unfamiliar or loud sounds, it is telling you something mechanical is going wrong — and the problem will escalate if left unaddressed.

What Different AC Noises Mean

Banging or clanking typically signals a loose or fractured internal component in the compressor, such as a connecting rod, piston pin, or crankshaft. Buzzing often originates from a deteriorating outdoor fan motor, loose hardware, or electrical arcing across a worn contactor. Screeching or squealing usually traces back to a failing fan motor bearing or a worn belt. Hissing or bubbling sounds are a strong indicator of a refrigerant leak — and operating the system with low charge causes progressive compressor damage.

Quick Things You Can Check

Verify the outdoor unit is free of debris — sticks, leaves, or objects contacting the fan blade produce rattling and grinding sounds. Confirm the unit sits level on its mounting pad; settling can press refrigerant lines against the cabinet and create vibration noise. For indoor noise, inspect the air filter — a heavily clogged filter forces the blower motor to work harder, which amplifies sound.

When This Becomes a Serious Problem

Compressor banging means internal components are sustaining damage on every operating cycle. A hissing noise means refrigerant is actively escaping, which will eventually cause your AC to stop cooling or freeze the evaporator coil. If the noise coincides with your AC cycling on and off rapidly, the underlying issue is worsening.

When to Call for AC Repair in Asheville

For any sudden, severe noise — particularly banging, grinding, or screeching — shut the system off immediately and contact us. Quality Mechanical offers same-day AC repair in Asheville, and our technicians resolve the majority of noise-related AC issues in a single visit.