Possible that mild cooling decreases arousal but more severe cooling raises this. For the range of temperatures normally found in offices little effect of temperature or performance may be expected. Also, different limits as a function of different air velocities. But it leads to hypothermia i.e. core temperature below 35 C, which can be fatal. Note when hot, heat loss is via peripheral vasodilation not conduction, that is, there is little difference between thin and fat people.
Fat people start shivering at lower skin temperatures and it takes longer for shivering to start.
In part this may be why we tend to increase weight in winter months and decrease in summer. Cold Acclimatization Acclimatization to heat is a well-established response to repeated exposure to heat stress. It is not even clear whether general cold acclimatization actually occurs. Local acclimatization Good evidence for local adaptation of hands exposed to cold. This occurs because of increased blood flow to hands.