Based on our findings today, it might be time to think about getting a brand new system. Today we came out for bonus room not heating 2000 Lennox 60k with matching 2 ton ac R22. Cycled equipment from thermostat found fan running non stop. Checked all safeties they were closed upon further evaluation of equipment found failed board with bottom of board melted. Inspected heat exchanger with digital camera found severe metal fatigue, hot spots and rust. Heat exchanger is compromised and part is obsolete. Gas piping at furnace is not up to current code, there is minimal flood protection and client has ductboard plenums. Equipment also uses obsolete r22 refrigerant that has been mandated by the federal government. Scheduled install supervisor to give options on updating equipment system is over 25 years old