I always thought the range between 65-70F is generally believed to be the most comfortable. The energy efficient/saving PSAs use to always advise us to keep it at 65F or even a bit lower. Most homes I visited, in the winter they usually keep it at the high 70s, which I personally think is way too warm.
Enjoy any good things, even the little and menial ones, as you will never know what impending distresses could descend upon you in a moment.
If I fail to adapt to the fault of others, it is my fault.