A little soft hum is normal for an AC. But loud or strange sounds can mean trouble. Here is what some common noises may mean.
Banging or clanking
This can mean a loose or broken part inside the unit. Turn the AC off and call for help before it gets worse.
Buzzing
Buzzing can point to an electrical problem or a part that is going bad. Electrical issues are not safe to ignore.
Squealing or screeching
This often means a worn belt or a motor problem. A tech can replace the part before it fully breaks. If your AC makes any of these sounds, call PolarFix.