My living room will sometimes hit 70 at the thermostat on cold nights. It's not intentional; I have a Nest thermostat with sensors, and my bedroom runs 4-6 degrees cooler than my living room and can take a little while to heat up (corner bedroom with windows on the 2 exterior walls).

That said, I keep my temp set at 64 degrees but will sometimes up it to 66-68 if I'm feeling chilly while working from home. Layers, cozy socks, and blankets are my friend. I live in ~1100 square feet, and my bill last month was around $160, which I thought was high. Posts like these are a handy reality check.