Upon arrival inspected system for any bacteria buildup, found no major concerns with main system. Only concerns are underlying with the ductwork. The existing ductwork is very filthy internally and possibly a heavy cause of the allergy attacks. Recommend fresh air corp to come perform full ductwork cleaning. After bacteria inspection was performed, perform heating inspection verifying ready for the winter season. Gas heating preventative maintenance performed Check filter - 20x20x1 new today Clean flame sensor Ohm test igniter: 54.7 ohms Inspect wiring for loose connections and/or hot spots - none found Inspect exhaust flu - no concerns Set thermostat for heat Check amp draw on blower motor: 3.64 Check amp draw on inducer motor:0.78 Check delta T - 53° Furnace is in optimal running conditions