Upstairs furnace- 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. Blower wheel in furnace is dirty reducing efficiency. Downstairs furnace- 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. Blower motor booster is out of range and not giving correct power to motor. Replaced blower motor booster. Flame safety sensor out of range and barely detecting flame. Replace flame safety sensor and tested operation. Due to age and condition of system, replacement is recommended.