In the winter, we do around 62 F by day, and no higher than 58 by night. If we have guests over, I'll temporarily turn it up to 67 or 68 for their comfort since everyone else we know is not used to seasonal temps and in my view is super wasteful (as in having parties, heat cranking and doors wide open!). I grew up in a household in the frigid northeast and our nighttime setting was 55 with extra cozy covers added on the bed, which I'm fine with, but my Southern DH thinks that enters the crazy zone, so I'm a little bit more spendy on this than my parents. I do lower to between 50-55 if we go on vacation... just enough heat to keep the pipes from freezing.
By the time summer peaks, I'll cool to 78 by day (if i'm in the house, 80 otherwise), with windows open at night to cool for sleeping then shut right after sunup. When it starts staying really hot even after sunset, I'll turn on AC until it gets down to whatever is comfortable...hopefully 75, but sometimes I need 73 or so to sleep if I haven't spent much time outdoors in the higher temps.
For those who did not grow up following the seasons and are interested in being more efficient, you might not realize your discomfort is temporary. Your body will adjust in about two weeks. (Also sweaters work!) I'm uncomfortably hot at 70 F in my friends' houses in winter, and shivering with cold at 65 F in when visiting them in summer because I'm acclimated to the season. (Why some people actually reverse seasonal temperatures in their homes and don't consider outside temps in dressing and layering, I will never understand!)
Right now we are enjoying the sweet spot of autumn in the U.S. Upper South. We haven't used any heat/cooling for over a month and I'm hoping with strategic window opening/lowering and shade opening/lowering, we can make it to at least Dec 1 without spending anything to adjust temperature. Once we made it until Dec 20 very comfortably. That was awesome.
One of my friends with a comparably-sized home in the same city recently complained to me about our city's electric costs for heating and cooling. They are spending about $100 more than we are per month so that they can wear similar clothing whether it is summer or winter. No thank you! :)