I too have had humidity problems just recently. Mine was getting to about 59% I think was the last reading I had, and this started to worry me. First thing I had to take into account, was where all this moisture was coming from. I had forgotten about a small bowl of water that I was keeping in the room to keep it higher, so I took that bad boy out, and I dropped to about 55%. I also have my plants set up in such a way to where the pots are in larger buckets, but are on risers, so that way when I water them, I can reallly water them, almost like a leach, but only with one gallon. and the water drains into the bucket below, but does not rise high enough to touch the bottom of the pot. So after a nice water, that means I have 3 buckets that have water in them which contribute greatly to a lot of the moisture in the air. I also have a circulating fan, but that only does so much. I happened to find a nice dehumidifier in my house which had a humidity control option. So I positioned the dehumidifier half in the room and half out. My humidity is at a consistent 35%, I can water how I please now, and it acts as an exhaust as it is sucking the humid air out of the room, and blowing the hot out. Wonderful thing to have as I do not worry at all about humidity, and I believe I read somewhere that dropping the humidity real low at the end of flowering is a great way to produce more trichomes. Depending on the size of your grow room, a standard dehumidifier should do the job. If your room is slightly larger, and you have the room, a couple small ones positioned close to your plants should really do the job. My room is fairly small, about 5'x4'x7', so the unit size that I have, (standard home size dehumidifier, 1 1/2'x1 1/2'x2 1/2') really does the job well. Best of luck on your humidity issue, hope my story has been a help to you in some way or another!