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One of the cheapest and most important pieces of equipment in the growroom is a Maximum - Minimum Thermometer.  This should always be placed amongst the plants and consulted and reset daily.  It will tell you the highest and the lowest temperatures reached during the previous 24 Hrs.

Once you are established it will be a simple matter to adjust your equipment to maintain the even and constant temperature that you are aiming for.  If the max temperature is getting too high you adjust the thermostat or timer on your extractor, if the min temperature is getting too low you adjust the thermostat on your heater.