Why is my air conditioner running but not cooling the house?

Why Is My Air Conditioner Not Cooling the House can be due to several different reasons but most common reasons are the 12 Common AC Problems are 

1. Clogged air filters

2. Air conditioner low on Freon – Refrigerant. 

4. Duct dampers closed.

3. Ice on indoor coil. 

4. Air leaking from ducts. 

5. Outdoor compressor is not running. 

6. Bad capacitor.

7. AC thermostat going bad. 

8. Fan motor issue.

9. Direct sun coming in the house.

10. Lack of insulation in attic or walls. 

11. Windows / doors seal bad. 

12. Outdoor coil dirty.