1 degree F is right on the borderline of detectability, and in my opinion that's just right. FWIW I do make single degree changes to the AC reasonably often and

1 degree F is right on the borderline of detectability, and in my opinion that's just right. FWIW I do make single degree changes to the AC reasonably often and notice the difference. That might be due in part to convection nonsense in my house, but that's arguably another argument in favor of that level of precision being useful in practice. I can believe centigrade-and-a-half works fine too, but that doesn't itself undermine the idea that F is kind of handy, with that tiny bit less bother. Again, not saying F is great, just that that one minor advantage is in fact real.