Until the 1980s very few houses had central heating. Most people heated one room, had hot water bottles at bedtime and wore warm clothes. I can recall quickly going out of the warm front room and shutting the door behind me, if I wasn't quick enough there would be be the shout of ‘shut that door’
Nowadays I wear a tee shirt in winter and keep my house at 20c… I think I will be going back to my childhood ways this winter..