On this job today I looked at heat and cool for 3 systemz . The upstairs system test out of tolerance. I had 0 degree super heat. This indicates the system has a metering problem. Airflow on the system test intolernace. The compressor is now sucking on liquid. This will kill the compressor sooner then later. Having warranty would surely help for making repairs but that has come and gone.. I have estimates to fix this issue . Also all uv bulb are out Also the water heater is beeping and show signs of wear and tear plus age. They aren't ready to replace the upstairs system just yet but will do so when the time comes.