24 seems insane to me, that is way beyond uncomfortably warm. At night I'm pretty sure that's just unhealthy.
I tend to keep temperature around 16-18 degrees celsius in the winter during the day, never had a thermostat that allowed setting a target temp so it fluctuates. 16 is alright with double or thick socks and a sweater even when i sit around at my pc. At night I just turn off the heat and open the window, it gets cold but it's comfortable in a blanket.