Performed cooling maintenance. Checked electrical, mechanical and performance of the system. Cleared and treated the drain line and washed the condenser coil. I found both the coil and blower wheel covered in mold and dirt. No other major issues found. I presented the customer with options to repair, and he chose to have the blower wheel replaced and do an in place coil cleaning. Replaced blower wheel. While replacing the wheel I wiped and cleaned the blower housing and around the air handler as best as I could. I also did in in place coil cleaning which took off a lot of dog hair and gunk that was in the coil. After performing the work, I turned the power back on and cycled the thermostat. The system is on and running at this time.