The answer to 'air conditioner making loud noise' is that there are several common causes, including worn-out parts, loose components, or issues with the compressor. Symptoms may include rattling, banging, or screeching noises coming from the outdoor unit. In many cases, the solution involves replacing a faulty part or tightening loose connections.
If the noise is severe or accompanied by a loss of cooling performance, it's best to call in a professional HVAC technician. They can diagnose the root cause and make the necessary repairs to restore your air conditioner to proper working order. Attempting DIY repairs on a noisy AC unit can be risky and may lead to further damage if the issue is not properly identified and addressed.