For this job I performed a super tune-up on all three units. Several issues were noted about the oldest unit probably original to the home. I made a list of refurbishments that I would recommend if trying to keep the current unit running for a longer period of time. Several issuew were noted with the oldest unit during inspection. Homeownes would like a Comfort advisor scheduled 3-5 2/23/25 to run a energy audit and give options for a system upgrade.