I know some people who leave fans on in their house during hot summer days when no one is home, believing that this practice will keep their home cool until they return in the evening. When you tell these people that this practice is a waste of electrical energy, and their house may actually be warmer when they get home, they usually come up with excuses such as, that they want the air to be circulating, etc.
I remember some years ago, elderly people in France died during a heat wave, because their residences were not air conditioned. Could these deaths have been prevented by using methods and equipment that might have been available to them?