Gender and body mass play a part, but I guess it also just depends what you're used to. I live in Scotland (1C just now), and through gas central heating (very

Gender and body mass play a part, but I guess it also just depends what you're used to. I live in Scotland (1C just now), and through gas central heating (very common) we have the house between 18-20C degrees, depending on how we feel. When we travel somewhere hot on vacation, and are using AC indoors, we usually have it between 20C and 21C. When I travel for business to India, the AC in offices is generally set at 25C, and I find that really unpleasantly warm, to the point where it makes me sweat (I'm not a particularly large person) and makes me sleepy.