HVAC question

Grown n Oregon

Active Member
whats up fellas...got a question about HVAC i could use some advice or opinions on...i recently moved my grow room from my spare bedroom to an outside room i built in my back yard. what i got is a 8x12 room and inside that room i have a 8x7 flower room and a 8x5 vegg/clone room. in my flower room i run 2 -1000w hps with a 8" vortex 850cfm fan and 2 8inch air cooled hoods. my fan sucks directly fromthe flower room and blows through the hoods and out the wall to the outside into a 8" carbon filter. the summer here in east oregon gets hot..and i mean hot! 100f-110f during end of june through begining of Sept, so a/c is a must. i have a portable a/c because an in the wall unit is almost an impossible task to acomplish. ive tried ducting my ac exhaust in to my 8inch line at the wall where it exits the room into the filter but it was to much for the blower fan that cools the hoods to take on and it made my hoods get hotter than they should be. so my question is would it be more effective to cool the vegg room with the a/c and hook up a dayton 6" squrel cage blower i have laying around to my climate controller and have that blow cool air in to my flower room when temp hits 75???...or put the a/c in the flower room? my concern with putting the a/c in the flower room is that the 8" blower sucking out of the flower room will just suck all the nice cool air the a/c is delivering as quick as it delivers it...come on hvac prows, speak up please!!! thanks and merry growing to all
 
he3y bud, just a couple suggestion.

inline fans are much more efficient when pulling air as opposed to pushing it. especially through a carbon filter. the way you have it setup you fan is probably pushing some hot air back into your grow room through the seams in the hood. also, carbon filters are meant to have air pulled through them. not pushed. especially if there is a prefilter on the outside. i suggest moving your carbon filter inside the space. connect it to an open end of your reflectors. then connect the inline fan to the other open end an pull air from the room, through your filter, through the 2 hoods, and then exhaust it using the fan. get your fan as close to the exhaust hole as possible. also use foil tape to seal your hoods up well if they need it. this will run much more efficiently and possibly help reduce temps.

if you use a portable a/c then run your lights on a closed loop. meaning draw air from outside through the hoods and exhaust it back outside. no need for a carbon filter. just seal the hoods and there will be no air mixing between the room air and the air being pulled through the hoods. then just hang your carbon filter from the ceiling with a small fan (4") and recirculate the air in the room through the filter. this will eliminate any spores, mold, mildew, odor, etc....that gets into the room via cracks or opening the door. you don't want to hook the a/c up to anything. if you hook it up to a fan and draw air through it you will burn up the motor on the a/c. just stick the a/c in the room and connect the ducting (single or dual hose?) to a flange on the wall that has an exhaust port to the outside. i would suggest just putting a bug screen or light filter sheet on that port so you don't get any bugs, spores, mold, etc...creeping back into the room. keep the a/c in the flower room and just use a cheap ($50) thermostat controller hooked up to your squirrel fan to suck air into the veg room when the temp gets too hot.
 
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