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Soil temp w/ heat mat on all the time- 98 deg. I removed the plastic for a couple hours to see if soil temp would drop enough, no it didn't. (92) Next, I hooked the hydrafarm thermostat to both, the heater & the mat. Now, when the temp drops low enough to turn on, it turns both on at the same time,& both off at the same time. Air temp avg. = 86, Soil temp stays at 80. I like that better.
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