I conducted a comprehensive performance maintenance check. I performed combustion analysis, temperature split, and static pressure tests. All mechanical and electronic components of the furnace were verified for proper operation. The blower was inspected for cleanliness and bearing play. Dust accumulation on the heating and cooling fan was noted. The heat exchanger was checked for proper flue gas venting. The humidifier was also verified to be operational. Both the furnace and humidifier are currently functioning correctly.