If your AC is running but not cooling your room, there could be several reasons — and most of them can be fixed quickly by a certified technician. Before you call for help, here's what might be going wrong.

1. Dirty Air Filter

The most common culprit. A clogged filter restricts airflow and prevents cool air from circulating properly. Clean or replace your filter every 3–4 weeks.

2. Low Refrigerant Gas

Refrigerant is the chemical that makes cooling possible. If it's low (often due to a leak), your AC will struggle to cool effectively. This requires a certified professional to diagnose and refill.

3. Frozen Evaporator Coils

If the coils freeze up due to restricted airflow or low refrigerant, the AC stops cooling. Turn off the unit and let it thaw for a few hours, then call a technician.

4. Blocked Outdoor Unit

The outdoor unit needs clear space to release heat. If it's blocked by debris, furniture, or walls, efficiency drops significantly. Ensure at least 2 feet of clearance around it.

5. Leaking Ducts

Ducted ACs can lose cool air through gaps or cracks in the ductwork before it even reaches your room.

6. Wrong Thermostat Settings

Double-check your temperature settings and mode. Sometimes the AC is accidentally set to "Fan Only" or a temperature higher than the room.

7. Ageing Unit

AC units older than 8–10 years often lose cooling efficiency. Regular servicing can extend their life, but replacement may eventually be the better option.