The attribute thermostatMode is considered active when it contains one of the following strings:
'auto', 'cool', 'heat', 'emergencyHeat'
It’s based on whatever styles are applied. By default it will use the ‘active’ style from your Theme (the default active style for a new theme is blue).
Or if an active style is explicitly set within the Tile settings, it will use that.
(And if it’s a legacy dashboard with an active color set in the dashboard settings, it will use that.)
There’s a feature request open for it which you can vote on in the following thread. It’s one of the top requested features at this point, so it’s likely to be on our short-list soon:
