Fast method for balancing temperature in Indigo using multiple sensors.

temp_balance.py

# turn on the fan if temperature in the house is uneven

try:
    import indigo
except ImportError:
    print 'ERROR - this script must be run from within Indigo'
    raise ImportError("module 'indigo' not found")

logger_name = 'HVAC Balancer'

################################################################################
## custom Indigo objects

# "Downstairs Thermostat"
thermostat = indigo.devices[1532090072]

# device ID's for temperature sensors
sensors = (695911461, 1215250024)

var_max_temp = indigo.variables.get('cfg_hvac_balance_max', None)
var_min_temp = indigo.variables.get('cfg_hvac_balance_min', None)

################################################################################
## utility methods

# display an informational message
def log(msg, *args):
    indigo.server.log(msg.format(*args), type=logger_name)

# display an error message
def error(msg, *args):
    indigo.server.log(msg.format(*args), type=logger_name, isError=True)

################################################################################
## MAIN ENTRY

temps = [ int(indigo.devices[dev_id].displayStateValRaw) for dev_id in sensors ]

min_temp = min(temps)
max_temp = max(temps)
current_temp = int(thermostat.displayStateValRaw)

# when the HVAC is in 'heat' mode, we need to ensure there are no 'cold' spots
if thermostat.hvacMode == indigo.kHvacMode.Heat:
    if var_max_temp is not None and max_temp > int(var_max_temp.value):
        log('Temperature is too hot: {}', max_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.Auto)
    elif min_temp < current_temp:
        log('Temperature is unbalanced; starting fan: {}', min_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.AlwaysOn)
    else:
        log('Temperature is stable: {} - {}', min_temp, max_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.Auto)

# when the HVAC is in 'cool' mode, we need to ensure there are no 'hot' spots
elif thermostat.hvacMode == indigo.kHvacMode.Cool:
    if var_min_temp is not None and min_temp < int(var_min_temp.value):
        log('Temperature is too cold: {}', min_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.Auto)
    elif max_temp > current_temp:
        log('Temperature is unbalanced; starting fan: {}', max_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.AlwaysOn)
    else:
        log('Temperature is stable: {} - {}', min_temp, max_temp)
        indigo.thermostat.setFanMode(thermostat, value=indigo.kFanMode.Auto)