Furnace Maintenance: Replaced the homeowner provided media filter (16x25x1), added air flow arrows as a reminder for filter orientation. Recommend changing filters every 3 months to 6 months. Flushed the condensate P-trap and drain lines to maintain clear, efficient flow. Checked pressure switch tubing to ensure reliable performance. Cleaned and polished the flame sensor for optimal ignition. Ran full diagnostics to confirm the system is running smoothly and efficiently.