Performed Precision AirmConditioning Tune Up/Inspection on Unit. Replaced the 16x25x1 Air Filter. Tested Electrical Components on the Indoor and Outdoor Units. Measured Refrigerant Charge on system. Refrigerant Levels are running to standards. Performed Precision Heat Tune Up/Inspection on the Gas Furnace. Inspected Heat Exchanger and tested the Integrity of the Heat Exchanger using a Smoke Test. Heat Exchanger passed the Smoke Test. Measured Gas Pressure of Unit while performing Combustion Analysis on Furnace. Furnace is running to standards. Both the Air Conditioner and Gas Furnace are running to Manufacturers Standards. System is old, Manufacturer date is from 1993. While the system is operating to specifications it is not operating as efficiently as a new system. Recommend performing Annual maintenance on the Air Conditioner and Furnace to help maintain the system, and help prevent issues from arising. Also recommend begin planning for replacement of the Gas Furnace/AC.