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Abstract: The science of air conditioning, as we know it today, was placed on a rational basis in 1911, through the development of the "Pychrometric Formula" by Dr. Willis H. Carrier. This formula established the relationship between air and the water vapor in air, thus enabling an exact calculation to be made as to temperature and humidity in any process involving the use of air. Whereas such a process had been simply a matter of trial and error, the science of air conditioning has since become a mathematical problem, wherein certain factors are placed into an equation, and the end result to be expected can be predicted with reasonable accuracy. To you gentlemen who are growers of mushrooms, this fact is of importance. It is no longer necessary for you to guess or estimate "how much air conditioning equipment should I purchase?" It is now your prerogative to state "I want a room temperature in the mushroom house of so many degrees at a relative humidity of so many percent during the Summer or Fall seasons of the year, and the installer of air conditioning equipment can then readily calculate the required equipment capacity. It is important to purchase the correct air conditioning equipment capacity, not only from the standpoint of first cost, but also from the standpoint of maintenance of proper room conditions and economy in operating costs. It is no more correct to purchase a system which is 10% short of required capacity, than it would be to purchase a heating system for your home which in cold weather could only maintain a temperature of 65 F. Conversely, an air conditioning system, which is purchased sufficiently large that it can satisfy the room thermostat and shut off when the outdoor temperature is in the 90's, is oversized and therefore unnecessarily large.
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