Basement system is a 2018 Rheem heat pump working great. The only recommendation for this system is to add flood protection to cut the system off if the drain line gets clogged before the house gets wet. The attic unit is a new 2024 Goodman furnace and AC that is performing great. The only recommendation for this system is to have the condenser coil cleaned. The main floor unit is a 2009 Rheem furnace and AC that uses r-22 refrigerant, a refrigerant that is no longer being made. It has a single wall flue pipe instead of a double wall flue pipe, this is not up to code. It also has a flex pipe taking gas into the system instead of hard pipe. The system vibrates when in use and this vibration can damage flex pipe and cause a gas leak. Building code requires hard pipe, not flex pipe going into the system. The blower wheel is dirty, causing a strain on the blower motor. The ducts are very dirty. There is lots of biological growth in the system negatively impacting the indoor air quality.