If you are using the room the tent in as your lung room, I'd put the humidifier and sensor in the room for a more steady rH and if you have a ceiling fan, turn that on low to circ the air. I think you should see if the controller can be set to control the temp with s user set speed and it can ramp the fan up or down to maintain the set temp range.
By using the lung room with the humidifier in there, your VPD in the tent will be far more stable
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