Yeah, even my mid 90s built house had that. It was easy to see how it worked, too—a big spinning wheel that represented the 24 hours in a day. There were little

Yeah, even my mid 90s built house had that. It was easy to see how it worked, too—a big spinning wheel that represented the 24 hours in a day. There were little plastic arrows you'd snap onto the outside of the ring at the appropriate time. Red ones and blue ones. Each color had an indentation in a slightly different place so as the wheel spun past the "now" marker, it would flip one of two switches. The switches controlled energy saving mode. It actually wasn't super intuitive (in cooling mode it inverted the sense of energy saving mode, if I recall correctly), but it was easy and never failed me once I set it up.