The customer had recently had their ducts replaced, and they were experiencing some issues with their air conditioning. I arrived at the customer's home and performed a thorough inspection of the air conditioning system. I found that the ducts were installed correctly, and the air handler was functioning properly. However, I noticed that the air filter was dirty, which was causing the air conditioner to work harder than necessary. I cleaned the air filter and replaced it with a new one, and the air conditioner started cooling the home more efficiently. The customer was very happy with the results, and I was able to provide them with some tips on how to maintain their air conditioning system in the future.