hydrochron. dude my incoming water temp is 78. putting a frozen jug in there will probably do more damage than good.too inconsistent. those subculture things can work but a lot of them have copper in them which helps sanitize. but it sanitizes everything, even the good guys. a/c is a must and...
don't skip security steps. once u get the noise down, then u will hear oscillating fans, pumps and ballast hum. a sealed room helps with smell issues and keeping negative pressure inside the grow area.
put down a 2x6" sill and top plate. stagger 2x4's so that sheetrock is touching the inside of the room, use the 5/8" flame retardant drywall, insulate with r-19, then put whatever material u want on the outside. the 4x8 sheets of 3/4" foam have an r-5 value. fans, get inline ones not squirrel...
the styrofoam sheets for the floor should help buffer the cold. yes too cold is bad. my coolers help me even when it does get cold because they buffer any temp swings. temp diff is good for the plants but not the roots. things should stay pretty constant there.
i've seen some of the square water coolers from powerade. not sure if it would fit though. it might be possible to still transplant to the round setup if u have to. don't be scared to try to transplant, there's nothing worse than the feeling of pulling out the brown roots and watching stuff go...
i'm in the tropics and i use 28 or 40 quart coolers with 6"net cup holes in the top. my nute temp stays at the lower end of whatever i set the wall unit 2. u can get some of the really big coolers for your rez if running a different system. i just bubble the heck out of the coolers. that's...