Arrived on site for an odd noise coming from the downstairs furnace/plenum. The plenum was located under a drop ceiling and was making a loud rattling noise. It was running and rattling against the hard piped duct work and making a loud noise. The duct work was easily manipulated to fix the noise but with the age and condition of all the duct work, long term solution may require some design consultations to get the airflow/duct work replaced. We did sign up for Homecare while on site and looked through each system in totality. Both units have 2006 trane AC systems and upstairs has a 2006 trane furnace, while downstairs was replaced in 2019. The upstairs unit, we found, has a cracked heat exchanger among many other concerns we spoke about. Downstairs is newer and without major issues but we still have a lengthy repair list for items discussed today, which we emailed over. Upstairs we have a comfort advisor coming out to discuss long term solutions from 2-5. Systems are fully operational