It's more achievable in a small single-story apartment, or better yet, a car. I can really feel the difference without looking at the number. There's also what you said about the trigger points, but it's still a good reason to have precision on a thermostat. I felt like it was slightly too cold yesterday, so I moved the thermostat up 1˚F and it felt warm enough.

And I'm not a scientist, but in science classes we were only using Kelvin, not Celsius. C and F aren't useful for proportions because 0 isn't 0. Even Rankine would be fine, just use different constants.