Performed cooling maintenance on two Carrier Infinity systems. Checked all electrical, mechanical and performance of both systems. Cleared the drain line and washed the outdoor coil. I replaced the filters with customer supplied filters and also removed the 1-inch filters. I did find that both blower wheels are dirty, and the majority of the ducts are dirty as well. The air purifier on the system on the right side of the home has failed. The condenser fan motor on the right side is showing signs of overheating. No other major issues found.