Furnace Maintenance: Replaced the media filter with x6670 (16x25x5) 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. HRV: Removed and cleaned the core. Vacuumed each section, followed by vinegar polish. System is operating well.