Here's a dumb question but I've been all through the menus multiple times and I can't find where to turn on the display for Fan and Heater (the red and black lines that track those levels)?

I assume you are looking for the red and black lines at the bottom of the graph, as in this screenshot.

You might try playing with the settings under Config --> Events --> Style and see if one of those options gives you what you want. I haven't played with them myself, but I wonder if Hex 1 and Hex 2 are what you are looking for...

They also may not be available in newer versions of Artisan. MaKoMo?

What do you all have your smoothing values set to (Tools > Extras > Graph)?