After a few experiments, I finally found out how to configure a HomeKit automation that turns off / on the AC power when the windows open / close. Posting this here if it turns out useful to anyone in the future. I would also like to know if others have a more elegant way to create this automation.

& # X200B;

A simple "If window sensor A opens, trigger Ecobee" and "If window sensor A is closed, trigger Ecobee on" setup would not work for my home because if windows B and C remain open after a window is closed, I want AC to to stay away. I also don't want the system to turn off and on again immediately if someone just opens a window for a few seconds.

& # X200B;

A simple time automation like "If window sensor A is opened, then wait 1 minute and release Ecobee, if window sensor A is still open" would also not work for my home because I needed to make sure the system would shut down if the window was closed and another window was opened in the meantime.

& # X200B;

In addition, there were several app-related limitations to overcome: The home app does not allow rule conditions or more than one trigger per. Rule, and the Eve app does not allow the OR logic (ie, if there is any window open, rather than all windows), and the timer ("Undo" after X minutes) in the Home 3 app did not work for me. I ended up using all 3 apps to create this.

& # X200B;

** Equipment: ** Ecobee 3, Aqara hub, Aqara window / door sensors and Apple TV 4

** Apps used: ** Home 3, Eve and homely home app

& # X200B;

** Automation: ** Turn off AC if a window is open for more than 1 minute. Restart AC when all windows are closed.

& # X200B;

** Rule 1: ** Set one minute of hours when a window opens

Add home rule: When window sensor A is open, turn on Aqara light and then turn off after 1 minute.

Edit rule in Eve: Add trigger to all other window sensors (Eve's UI makes it much easier to turn this into many sensors than Home 3's)

* Note: I could have * (* create an hour through Mi Home app *) (https://www.homekit.blog.com/r/HomeKit/comments/bh9x9j/thermostat_automation_with_door_sensor/elr9zhu/) *, but I didn't & # 39; I don't want to have the automation created in multiple ecosystems. *

& # X200B;

** Rule 2: ** Turn off the AC after one minute if a window is still open

Add home rule: When the Aqara light goes off, turn the Ecobee mode off

Edit in Eve: Add condition for rule if all windows are open

Edit in Home 3: Change the logic of this condition from AND (all windows) to OR (any window)

& # X200B;

** Rule 3: ** Resume AC after all windows are closed

Add rule at home: When window sensor A is closed, turn on Ecobee for cooling

Edit in Eve: Edit the shutter to run if any windows are closed, add condition if all windows are closed

* Potential improvement: instead of cooling Ecobee for cooling, * (* set it to run a scene to CV) * (https://www.homekit.blog.com/r/ecobee/comments/bpe83d/changing_autoheatcool_with_homekit_automation/enul0z5/ )