Thanks for sharing!
Right now I’m focusing on comparisons to other systems. I like your charts and how they are helping you visualize things. I think the biggest thing beestat could use is some sort of year-over-year comparison feature so you could easily see how things are trending in your own home.
The one thing I would suggest to you is to learn about heating and cooling degree days. These are fairly new to me, but basically instead of using average, min, or max temperature, you use something called a degree day for all of your comparisons. This has become the standard way to do this sort of thing. I plan to utilize these for some of the new metrics. I think they will convey some of what your charts do, just a little more rigid right now.