Cleaned & checked 2 gas furnaces. Inspected heat exchangers & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Test capacitor. Second floor: Checked temperature rise. 47. Supply: 121. Return:75. First floor: Temperature rise: 48 . Supply: 122 . Return: 74 . Clean and check 2 humidifiers, replace pad, checked water flow and drains.