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I would not recommend ecobee, it does not allow you to apply simple actions you may want to do. For example, using HA I am monitoring co2 in the bedroom, if the level rises above 1000ppm I wanted to turn on house fan until level reaches a value. You cannot simply turn central house fan on/off at will, you can only apply a hourly duty cycle controlled by ecobee. I wish I would have purchased a thermostat with basic api controls.

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Do you have a one hour hold duration configured within your ecobee? I have a Home Assistant switch entity that turns the ecobee furnace fan “on”. Turning the switch off returns the ecobee to “auto”, or it will do so on its own after the two hour hold duration I have set in my ecobee. I believe you could accomplish what you want by setting your hold duration to “until I change it”.

Thanks for the info, I will give that a shot.

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