Surface temperatures broadly influence economic output through their impact on worker’s productivity.

Plant level manufacturing output responds negatively to high temperatures. The magnitude of losses is economically significant of the order of 2^% of daily output per degree celsius

Body Heat Mechanism

The physics of how temperatures affects human beings is well known. The physical exchange of heat between the human body and the surrounding air is fundamentally related to health because in order to maintain normal body temperatures, the human body must dissipate the heat it generates internally to the ambient atmosphere. When energy is expended while working, internal heat generation increases and correspondingly greater rates of heat loss become necessary. When this balance cannot be maintained during normal activity levels then it becomes necessary, for safety reasons to reduce the rate at which energy is consumed or to suffer the adverse consequence of over-heating, including heat stroke.