Chill... So, here's my chiller I built. 5k btu AC on clearance: $60 Cooler: $15 Walmart Some temperature controllers off eBay: $20 each 200 gph pumps: $9 at Harbor Freight Plastic ammo box: $5 3 Outlets: a few $ at the hardware store A couple 50' coils stainless tubing off eBay: $70 Misc. tubing, wiring, relays, and crap that I have laying around. Didn't document the build, but basically cut the front of the AC off and covered the opening with a piece of white board, after positioning the evap core in the manner that it would fit in the cooler. Hooked the AC up to a temp controller. It keeps the water between 35 - 45 F. The temp controllers in the ammo box control the pumps in the cooler. A pump for the flowering res (nothing in the flower system yet) One for the veg res (currently being kept at ~65F +/- 1 degree F) One that will be connected to a small heater core and fan assembly to aid in cooling the flower room. No pic, but will be similar to the larger one I've built for the foyer area (so to speak) of my room, using a heater core from a Mack truck, the bottom of a plastic tool box, a couple 110v case fans, and a speed controller. I keep the pH above 7 and put a little bleach in once a week or so. Change out the water every couple months. I like building/re-purposing things. Plus, I'm a cheap bastard... Little luck7's are doing their thing, as well as all the new moms.