I have a bunch of hydrofarm clones that I'm using, they do fail in the on position, I found out just last week! Also, I'm using temp probes that record high and low temps. The on/off hydrofarm thermostats have a range of about ten degrees, I set them at 88F and they range from 82F to 92F. I also have a VE-300, its proportional and the range is only about 3 degrees from the high to the low temp. I actually just ordered a couple Herpstat 4 thermostats so I can dial in each row in my rack and keep the temps real accurate with a probe on each level, also can vary from row to row if I have a different mix of snakes. I actually tried to run the whole stack with my VE-300 and there were huge differences between levels (with the probe on just one level).
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