Just a update i change my box so i needed dehumidifier and i bought a Frigidaire 30 Pint its work very well, but in case you dont know dont put it in your growbox because the air is always come in the box, the best if you can like me i use my old small box and i put it inside so i take my intra from here with air duct, i have 35% with the dehumidifier i and its 42% in my new growbox.
Or if its too warm (because the dehumidifier blows warm air) you can just put in your room with door and windows close.