Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Replaced thermostat with a new one. Set thermostat to 75 at permanent hold. Walked customer through on how to operate it. Furnace is performing correctly and burning correct amount of fuel. Gas prices have increased by roughly 30% in the last few months. Not much can be done about reducing gas bill unfortunately. Overall furnace looks great and is performing correctly.