Look out for these signs: Reduced cooling efficiency. Unusual noises (grinding, squealing, banging). Foul odors. Uneven cooling in different rooms. Frequent cycling (short on-off cycles). Higher energy bills with no increased usage. If you notice any of these issues, it’s wise to contact an HVAC professional for an inspection and necessary maintenance or repairs. Acting promptly can prevent minor problems from becoming major ones and keep your AC running efficiently.