ecobee Thermostat indoor temperature is less than. WeMo Smart Plug Turn off.

Turn off Wemo Switch with Temperature from Ecobee

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I use this to turn off my window AC unit during the cooling months. The AC unit must have the recovery from power outage feature and I set the unit to a very low temperature. This is a very custom function and you will also need to adjust accordingly for the locaiton of the AC unit and your thermostat. You will also want to turn on rule - https://ifttt.com/recipes/386388-use-your-ecobee-temperture-to-control-a-wemo-switch