The fix: Ensure that all panels (on your outdoor and indoor units) are secure and tighten any loose screws. If your AC is still making a rattling noise, contact a professional.May 1, 2019
Why is my air conditioning unit rattling?
A rattling noise can mean that your air conditioner is starting to deteriorate, and some of its parts are loosening. Another cause could be twigs or leaves that have clogged your system.
What does a bad AC compressor sound like House?
What does a bad AC compressor sound like? Many times it will simply sound louder than it usually does. There are also instances when you may notice a rattling sound, which could mean a fan has become loose in the condenser unit.