Fujitsu Halcyon thermostat

I've had nothing but trouble from the dual head heat pump system that we had installed for our upstairs addition. Neither of the thermostats in either of the two rooms seem to regulate the temperature either in the summer or winter. It's still not clear that the wiring for the heads is to the correct terminals in the outside unit, but after switching them the system seemed to work better in the summer. Constantly rereading the fluffy installation manuals I got the idea the I could try to switch out the thermostat at least on the side that is wired. One of the problems with both the wired and the wireless thermostats is that neither one displays the room temperature, just the set temperature that was programmed.