I received a call from a customer who reported that their air conditioner was not cooling. I arrived at the customer's home and performed a thorough inspection of the air conditioner. I found that the condenser coil was dirty and clogged with debris, which was causing the unit to overheat and not cool the air. I cleaned the coil and replaced the air filter, and the air conditioner started cooling again. The customer was very happy with the service and thanked me for my help.