Thermostats and Humidistats

In general, thermostats and humidistats are designed to open and close valves in response to pre-set temperature or humidity limits. The instrument sensors are placed in a moving air stream representative of room conditions, usually in or near the recirculation inlet. Because these instruments are programmed for either on or off, heat and humidity come in surges. Often this results in uneven and fluctuating conditions within the room. 

The ideal in environmental control is to supply just enough heat and humidity to make up for losses from the room and to compensate for differences in the fresh air. Modulating thermostats do this by supplying heat continously in proportion to the deviation from the desired temperature. Positive control of this sort can also be accomplished by hand valves, alone or in conjunction with on/off instruments. Supply line volume is thereby regulated in order to attain an equilibrium. With a thermostat, this means keeping the supply volume just below the cut-off point. 

Many cultivated mushrooms require light for pinhead initiation and proper development of the fruitbody. In fact, such phototropic mushrooms actually twist and turn towards a light source, especially if it is dim and distant in an otherwise darkened room. Consequently, it is important to equip 

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