Completed furnace maintenance on both systems. I cleaned flame sensors and wiped down furnaces. I checked amp draws and tested components. I tested airflow and temp splits. I checked air filters and humidifier operations. Humidifiers are working properly, and I made a couple adjustments since one of them was leaking last year. The air filters are getting close to needing replaced. I found a wire loose on the second floor unit and tightened it down. Furnaces are operating within manufacture specifications tightened it departure.