Completed maintenance on 4 systems 3 conventional Trane systems and 1 Mitsubishi ductless unit. One out of the 4 systems is r-22 systems still in working condition homeowner is aware of age of units. Chemically cleaned evaporator coil. Inspected blower compartment and primary drain pan. Treated and cleared all drain lines, and traps. Homeowner had replacement filters for all electro static filters. Need to order extra filters for the 2nd floor system 20x25 part #3LP2020. Tighten and secured all electrical connections on both inside and outdoor unit. Tested all safety switches all in working condition. Need to replace 1x UV light bulb 3 uv light bulbs for each system. Chemically cleaned outdoor condenser and checked operations and refrigerant pressures. Pressures and indoor temperatures were good on all systems. Tested all electrical voltage, capacitors, and amperage on all motors and compressors. All units are operating properly at this time. Recommendations: Indoor head needs a deep