Performed preventative maintenance on AC systems. Changed filters inside the building. Inspected blower assemblies, motors, electrical components, drains, and overall condition of equipment. Cleared out drain on package unit, had a slow drain. Condenser coils are clean. Inspected compressors, fan motors, contactors, capacitors and operation of both systems. Checked thermostat operation, wiring, amps, temperatures and pressures of AC units. Both systems are cooling properly at this time. Newer unit is running off an older Honeywell analog thermostat, and was reading about 2 degrees off of what I had it set at, but it was cycling off and on correctly. Recommend a digital thermostat for more accurate temperature reading.