Buy a dehumidifier. Pretty easy solution. Depending on if you're dehumidifying the tent, or the room the tent is in...the price will vary. I'm lucky and grow in small 2x2 tents, so I can get away with cheap amazon dehumidifiers. The most cost effective way to do it, if you have the capital, is to buy a whole room humidifier from your hardware store. They run around 0 around where I am, and they can keep a whole room dry and drain into a bucket.