Can I systematically exclude a specific thermostat from Hilo peak events?

Yes, you can exclude a specific thermostat so that it is not automated by Hilo during peak events.

To do this, tap Events in the navigation bar at the bottom of the Hilo app screen, then go to the Manage My Event Settings section. Choose AM Events and/or PM Events, and tap the circle to the left of the thermostat’s name to deselect it (it will no longer be checked).

If you want this setting to apply to both morning and evening peak events, make sure to perform this action in both sections — in AM Events and in PM Events.

You have until midnight the day before a peak event to modify any settings.