I just setup @DarcRanger’s thermostat control via dimmer switches : Thermostat SmartApps that uses Virtual Switches to control Mode/Fan/SetPoints
And it works great!
“Alexa, set the thermostat to 75” feels natural and works great!
Now we just need a way to check the status of sensors like “what is the current temperature in the living room” or “is the dinning room window closed”. Although I think we would need an ASK Skill for this since the native integration will probably only do On/Off/Dim, unless Amazon opened up some more options.
I know @zpriddy had that on his To-do list for his skill 
So glad I bought the Echo!
Scott