Arrived to do a performance maintenance. Set up for combustion analysis temperature split and static pressure tests. Found that the system was burning almost 3 times the amount of gas it’s supposed to use. Checked the gas pressure the furnace is receiving. Found that the furnace is receiving 19 iwc gas pressure and the furnace is only rated to receive 10.5 iwc. Calibrated gas valve off of the 19 iwc to allow the system to operate closer to manufacturers specifications. Recommend homeowner speak with the gas company to have them rectify the gas pressure. Furnace will need adjusted once gas pressure is fixed. Verified operation of all mechanical and electronic components of the furnace. Checked blower for cleanliness and to see if there is any play in the bearings. Found that the fan is collecting dust debris. Checked systems heat exchanger to ensure proper venting of flue gas. Furnace is operational at this time.