I shared this concern, however so far it's been running solid now for over a month and hasn't messed up once. My "ventilation schedule" rule however sometimes gets out of whack. But that's not that big of an issue.
First I have a wood burning fireplace as my main source of heating and the propane hvac heater is more of my backup for when the fireplace is cooled overnight. Therefore I have a "Ventilation Schedule" that circulates my HVAC fan blower to help circulate heat from the fireplace and to filter the air. This only runs when outside temp is below 50 (which the temp must be below to have a fire going and not be to hot in the house)
Then I have the Thermostat Scheduler for operating the Propane Furnace and the Central A/C, based upon outside weather station temp, House Average Temp (changing is the trigger), and House Average Humidity (for A/C operations only at the moment)
Basicly, the House Average Temp reading is essentially "my thermostat", my actual Zen thermostat is basicly only a "switch" telling the heater/a-c/fan to turn on and off.
Also to get the "averaging of all temp sensors" I use this app. Averaging - #4 by bravenel
