Cleaned & checked 2 gas furnaces. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Replaced air filter. First floor system: customer complaint of noise when furnace turns on and when it turns off. I found no unusual noises at this time. Blower: 5.7A . Inducer: 1.25A . Gas pressure: 3.4inches water column. Temperature rise: 53 . Supply: 127 . Return: 74 . Second floor system: Blower:3.8A . Inducer: 1.2A . Gas pressure: 3.4inches water column. Temperature rise: 53 . Supply: 125. Return: 72 .