Rancos aren't proportional thermostats which means that they are just as inaccurate at cheap thermostats like hydrofarms.
Where is the probe? You might need to move it around.
So your saying that the fan is getting really hot and you think that the fan is what is bumping up the temp? (just making sure I'm understanding you correctly)
If so then as I said before moving the thermostat probe might help.
Are you sure that you are supplying the fan with the proper electricity? (you most likely are just trying to cover all of the bases)
Also temp guns only measure surface temperatures, not air temperatures. Something to keep in mind.
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