Hello,
New to HA, I currently have a Ecobee4 w/ Alexia (main floor). I want a second affordable thermostat for upstairs that I can control via HA. The currently issue I have is the baby sister have a penchant for leaving the A/C on up stairs when she is done baby sitting the baby. Which forces me to run upstairs and turn it off every time she leave. I will like to get a second thermostat that I can set to turn off once my motion sensor does not detect anything. I do not feel like giving up a kidney for a Ecobee or nest to accomplish this. Any suggest will be greatly appreciated.