last one, I promise:
this depends on what data is collected/sent to the server by the MT, but highlighting the areas on that chart where the MT has turned on the cooling/heating outputs with light red/light blue would be cool.
@hebnern: it looks like you hand-built a graph that does this to illustrate hysteresis.
http://dygraphs.com/gallery/#g/highlighted-region
Yeah, this one has been requested also, and is on our TODO list.