Not tried this myself but might be worth a try. I have used several instances of TC with the same devices, but using times to split them . Worked ok.
I don't think I can actually do what I thought. The COntroller itself doesn't have modes. The heat/auto/cool settings in the Controller app actually change the mode on the physical thermostat (or in my case, the test virtual thermostat I set up to play with).
I think the easiest thing from the end user perspective would be the ability to set the Free/Controlled setting via a rule. Or have "pause/resume" functionality like rules have.
I think the way to accomplish this that is the most straight forward is to give the app the same Restrictions options that you can find in Simple Automation Rule. This way, the app could be scheduled to only apply control during certain time periods, days of the week, etc, and to be disabled by switches, etc.
With this addition, two instances could control the same real thermostat with different sensors for different times, modes, etc.
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While we're discussing this, I think another value add would be to have manual changes on the thermostat update the controller target temperature.
For instance if I have the controller set to 68 and it feels a bit cool then, I can just set the physical thermostat to 70 and instead of the controller eventually taking over and setting the thermostat target back down to 65 or whatever, the Controller itself would be updated to set a target temperature of 70.
I'm guessing that would be a tough pull if a given thermostat doesn't give any feedback as to how/where a temperature was changed because the Controller app itself would change the target temperature a lot.
I'm not sure what the official way to say "Me too" is here. I came here looking for this exact feature for the same use case (use bedroom at night, other rooms during the day).
Yeah, I'm on it. Should be in the next release.
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Love this idea...would be useful to me as well. Thanks, @bravenel, and thanks @mikeobrian for asking!
Thanks! Looking forward to it!
I have some code in an app that changes the main thermostat's mode from Heat to Emergency Heat if the outside temperature drops below 40F. Is TC going to change that back to Heat or is it set up to recognize that as a heating mode and leave it alone?
It will leave Emergency Heat alone. However, I think I will test what actually goes on wrt to how it manages the heating setpoint. Presumably, if you're asking for Emergency Heat the main thermostat is demanding heating. What does putting the thermostat into Emergency Heat do? Override the setpoint logic?
It only changes the heat source from heat pump to natural gas. Everything else is left alone.
Awesome! Thank you!
It seems to be working -- thanks for the effort!
One more thing now, it would be useful to be able to override the app name as it's tough to tell things apart on the Apps page.
Yeah, you're right about that... OK, will do. Plus, I think you end up with two Controller devices with the same name. Not good.
Yeah, I renamed the devices to at least have confusion on the device page.
Now that it's cold enough to see things in action, the Thermostat Controller does actually interfere with the Main thermostat being set to Emergency Heat / Auxiliary Heat. I've set it to Emergency Heat manually and the Thermostat Controller App sets it back to Heat on the next refresh.
I set it to Emergency Heat when the outside temperature goes below 40F which causes the HVAC system to switch from using the Heat Pump to using Natural Gas, since the heat pump is less efficient at temperatures below 40F. It still works but it has to run a lot longer to heat the house.
My thermostat is a Centralite Pearl.
I will look into it. There are some improvements coming for the app. It makes sense that it is putting it back to heat. This is tricky, but I'll find a solution for it.
Thanks.
I'm using the Thermostat Controller App in conjunction with the KeenectLite App, which I modified to make the switch from heat to emergency heat based on the outside temp.
I think I may have a solution for you. In the KeenectLite app you have to specify the main thermostat device to monitor. If I choose the " Controller" device that is created by the Thermostat Controller App then it should make the change to emergency heat on that device, which you can then pick up on to send the appropriate mode to the actual thermostat.
Also, I really wasn't expecting a reply on Christmas Eve. 
Thanks.
The issue with it forcing into heat will continue, even when setting it to Emergency heat. This will be fixed in the next release.
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