Hemp grows nearly under every condition, but giving them the Optimal conditions let them explode. My recommondation is, get a Humidifier and a INKBIRD Controller. Just any Humidifier and the Inkbird controller gets you great success. The controller has two switches it can control ahumidifier and a dehumidifier ( or both at the same time.) I will let you the VPD-Chart in the comments there you can see the HUmidity you should reach in dependenca to Temperature and growstage, and the Link for the Inkbird controller.