Conducted a full gas furnace replacement today for a home in Philadelphia, PA 19130 that had previously been tagged by an inspector for serious safety issues. The original second-floor furnace had a cracked heat exchanger that was causing elevated carbon monoxide levels, and with no replacement parts available for that model, a full system swap was the only safe solution. We removed the old unit, reinstalled the existing evaporator coil properly, and set a new Goodman 60,000 BTU, 90+% efficiency furnace in place with updated venting, condensate tubing, fittings, and safety switches. After reconnecting the gas, electrical, and low-voltage controls, we performed full startup testing verifying CO levels, temperature rise, and gas pressure to ensure everything is operating safely and efficiently. The customer now has a fully compliant, reliable heating system backed by our 1-year labor warranty and a 5-year manufacturer parts warranty.