Greetings all, thermostat question here. Did as much homework as I could and filled our brains with info (or turned them into jelly). My HVAC installer calls me (as a compliment) the most involved home owner he has had in his 30 or so years. He has good experience and did a quality job, but this complex system is new to him and he does not want to steer me wrong. I knew he was honest when he admitted he was not as familiar with this and I agree it is hard to keep up with all the new stuff. I purchased a Goodman GMVC950704CXAD heat pump with a CAPF4860C6 Acoil and a DSZC160361AC comp. ProIAQ T855 thermostat. Am having a problem connecting stat and communication wires for full functionality. Bought 10 conductor stat wire and will use 2 of those for the communication. Outside and inside units have RJ11 jack for communication plus the normal wire set for control. Thought I had a 3H/2C system, but the stat manufacturer says I have a 4H/2C system and they don't make one for my type system-YET. Looks like a different stat is needed. Bit confused now. Will call Goodman, but thought I might get a word from the tower here to fly me through the fog...assist is much appreciated.