Is It A Health Condition When One Needs To Central Sir System And The Fans On When It Isn T Really Needed At Night?

Hi! My 40 year old son is ALWAYS hot!!! Even in winter he wants to sleep with a window unit on all night!!! His 2 daughters, aged 10 and 11, are the same way. Is there a condition that causes this? In the Summer they sleep with central air going, a window unit, a ceiling fan, and a box fan!!