A-Best: During the last oil crisis, room temp was set for public buildings at 78oF for summer and 68oF for winter.
68oF converts to 20oC , which is the temp used as room temp in general reactions.
humidity has a great effect on how warm we feel.
A: its not the heat, its the humidity... especially if you are using oil heat in the winter and a heat pump in the summer, oil is the driest and a heat pump is the wettest