Cleaned & checked 2 gas furnaces. Inspected heat exchanger & flue venting. cleaned burners & flame sensors. Checked voltage & amp draw of motors. Test capacitors. Tested thermostat batteries. Checked filter. First floor system: Blower: 5.1A . Inducer: 1.13A. Gas pressure: 3.5 inches water column. Temperature rise: 54 . Supply: 131 . Return: 78. Second floor system: Blower: 3.9A . Inducer: 0.73A . Gas pressure: 3.5 inches water column. Temperature rise: 59 . Supply: 126. Return: 76 . Suggestions: Replace air filters. replace second floor thermostat: $234 PMA price.