Arrived on site for a 3 system Homecare. Main floor is a 2024 daikin split system, upstairs is a 2010 trane split system and the basement is a 2014 trane split system. We completed a comprehensive overview of system performance, condition and safety. We flushed drain lines/pumps, replaced filters and ensured the system was performing within all manufactured specs. The main floor was running well, being replaced last year. The filter was very very dirty and we replaced the AprilAire 413 filter. No concerns in heating, cooling or communication at all. The upstairs unit was a cause for concern due to the breached heat exchanger we discovered during our inspection. All cells of the heat exchanger have cracks and the blower wheel is very dirty. There are no warranties on this system at all and we shared our findings about the heat exchanger with clients upon completion. The basement unit is the identical design as the upstairs unit, although. 4 years younger. Unfortunately we discovered bre