A nitwit recently started switching a Lux 500 thermostat to "cool" and setting its cooling level at 66 degrees. I think he has mental problems. I don't know for sure if he even understands what the effect of flipping the thermostat to "cool" and setting the temperature at 66 degrees is, and I don't want to waste any time tring to figure it what he understands or doesn't. I'd like to simply seasonally disable the cooling function of that thermostat while maintaining the heating function. It is connected to a single heatpump. The Lux 500 has the capacity to either toggler the heating function off and on or toggle te cooling function off or on but not both at the same time. If I can disable the cooling command without disabling the heating command, I'm sure the guy is too dumb to notice. Can it be done? The five terminal block connection points are labeled: G Y W RH RC. Edit: I'm slogging through user-group posts, and it seems likely that RH is for heating and RC is for cooling. If that is the case, then perhaps I could just disconnect the RC wire?