Upon arrival in Austin, I performed the A/C cooling evaluation and found everything operating properly at this time. The air filter had not been changed in a year and was not extremely restricted. I brought this to the customers attention i explained to him the importance in keeping up with the filters especially on this style of system. He was very pleased with the explanation and is going to stay on top of the filter changes. I also set his reminded on the wall control for everything 5 months to change. It was not changed at our last eval due to him not having the filters.