As @Mike1233 already suggested, please ask in the appropriate topic.
Most users in app-related topics have some of the devices from this manufacturer themselves and are therefore probably best placed to help. In addition, a HeatIt employee is also active in this topic and will certainly be able to answer most of your questions.
Regarding the colors, this is not a HeatIt-specific visualization but applies to all thermostats that are connected to Homey.
Blue: Actual temperature > set temperature (valve closed / cooling)
Orange: Actual temperature < set temperature (valve open / heating)
Black: Actual temperature = set temperature (valve ?)
You need to search the forum or describe your use case better so that someone can show you an example flow.
