Furnace clean and tune on both furnaces. Cycled both systems. Checked and replaced filter and water panels on both units. Checked both heat exchangers, ok. Removed and cleaned burners and flame sensors. All ok. Checked and adjusted gas pressures to maximize efficiency. Normal levels of XS air and CO in both exhaust tests. No CO found in either airstream tests. Both systems operating normal at this time. Ac clean and tune on both units. Checked and cleaned both electrical compartments. Fan motors and compressors tested normal. Used coil cleaner on condenser coils. Hooked up gauges and checked pressures and temps. All normal. Subcooling was 10 and 11. Both coils were 40 degrees. Temp split was 18. All systems operating normal at this time. Job complete.