Performed 1 system cooling diagnostic on the mainfloor hvac system. I found that the mainfloor system has failed compressor. The failed compressor is why the mainfloor is not cooling. I also found an improperly seal duct that is leaking air into the attic. I also found black biological growth on the outside of the evaporator coil (UV light is recommended to treat the growth). I also found that the system needs updated flood protection to prevent potential flood caused by the hvac system (in case of AC system failure). I went over these findings with the homeowner and emailed them estimates. The mainfloor hvac system is not cooling at the time of service call.