Earlier quoted context omitted.
Same here, but I want to say some bad things about old thermostats. My first house had propane heating, in a big tank that they would periodically come by and fill, so I had a visceral connection to how much fuel I was using. The previous owner had left the original 1960s mercury thermostats running the place, which meant that barring any initiative on my end the temperature was the same no matter if I was sleeping,…
Setback thermostats were invented a century ago — not digital.
https://www.ebay.com/itm/134131981597
Adjusted for inflation this would cost almost $500. Probably explains why the ones in my bungalow starter home were just bimetallic coils with mercury switches.