I did this with a dehumidifier I had... It works, it absolutely does... BUT, and a BIG BUT, the heat put off by the dehumidifer (maybe just mine) increased my closet temp to 100 effing degrees... I had the coils in one bucket cooling that water and a tube going from my main bucket, through the chilled bucket and back, so no water got contaminated from the metal coils... All in all though, it didn't work for me, and dehumidifiers are LOUD AS SHIT... What I ended up doing is getting Ducting Insulation... I used it to reduce noise when I got HID's and a fan/filter, and used the extra to insulate my rez... Everything except the bottom... I now have air temps in the mid to upper 70's and my res NEVER goes above 68 degrees... The cold nights help chill it good to and the insulation makes the cold last all through the lights on period.