Ok thanks fo input.......I have a cement floor the hole grow is on a slab of cement so if i did put the reso in the grow room it would be sitting directly on the cement......It already is positioned right at the passive intake hole but i was thinking of going to a sealed room with c02 and i thought that alone would cause more problems with my reso temps....I can put the reso under my tray in the grow room on a cement or i can put it outside the grow room on cement....eather way i just want to make it so i wont be killing myself trying to get the water temps down........from what everyones telling me i gather that the reso temps dont reach ambient air temps even when in the same room.....
I think a lot of factors would determine your res temps. How big it is, what the surface area of it is, what is the air like around the res etc...
Concrete is good, a cooler res is always better, aim for around 18-19 celcius. My plants bust in autumn and winter. Anyway good luck and enjoy the fast growth off hydro.
