Arrived onsite for heating maintenance 1 gas fired furnace with humidifier. Heat was upon arrival and confirmed operation. Filter in good shape 18x24x1z Brushed and Wiped down furnace blower cabinet and gas burners. Cleaned vent grills. Burners fired and are in good working order. Slight visual impingement detected. Checked electrical. Replaced flame sensor due to carbon buildup and it breaking. Measured 51 degree heat rise. System is operating as it should. Recommend upgrading system due to age and energy efficiency.
