I have my growroom and I have central air in my house. I dont know all that much about the workings of an ac unit...I know ducting but that doesnt help me here for what I want to do. I want to make this easy on myself...just get a 5000 btu or 10000 btu ac unit and set it in my grow room. will it have adverse affects on my plants if it is recycling the air instead of pulling in fresh air? it would only be on at night for 12 hours obviously...I also saw one that was just a room ac...is there a difference?....anybody have any input it's greatly appreciated.

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I don't grow..I just lieCheck my journal
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You cant just sit a window air con unit in a room & let er rip,the heat being exhausted will overpower the cool air being blown in the room & raise temps instead of lowering them.

If your going to run a window unit the unit needs to be mounted where hot exhaust will be directed out of the grow area,like this pic below,hot air is exhausted to a dead space then filtered before final exhaust.



Another option is to use portable room air con units that vent hot exhaust through a flexible duct either out a window or to an area away from the grow.

Even though i run air con units in my op's cool tubes are a much better option over air con,i will be installing to cool tubes next spring at the latest.

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once again panhead with the save. okay so I remember back when...i had an apartment that the ac took a crap in...they brought a window ac with a vent tube in and shot it out the window...helped a little. how much heat are we talkin though. I have plenty of attic space to vent to...I could even vent my hood to the attic..but at that point my attic gets even hotter and i will need to scrub the air up there.

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My units are 8,000 BTU's & create a good amount of heat using them in dry mode,the few times ive ran them in cool mode they blasted the shit out of the heat,roughly the same heat as running a 1,500 watt electric heater on high.

If you can vent to your attic you can use a cool tube along with a vent system,have one end of the vent drawing fresh air from outside the room & the other end pushing hot air into the attic,this way no dirty air is being vented into the attic,you'll only be venting heat not room air.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

okay so say I was to pull air from the attic and then vent to the attic?...now here is the real question...if you even can vent and pull from the same space couldnt you just connect the exhaust and intake? I know someone that does ac is laughing their ass of right now most likely but seriously. why couldnt that work? or could it?

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Ok i think i didnt explain properly,if you were to run a cool tube for your light you need 2 things,a place to get cool air from (attic air is normally too hot) & a place to vent the hot air into,a cool tube set up would need fresh cool air brought in from a cool room,out doors or someplace where the air is cool.

If you were to use the attic for intake & exhaust what you'd end up with would be a heating cycle,this heating cycle would be much like a cars engine coolant,a closed system that gets hotter with each pass,every time the exhaust vented hot air into the attic the temp would rise,now the intake is taking the allready hot air from the attic & heating it again as it passes the light,with each pass the air is getting hotter & hotter, taking away any cooling effect of the cool tube,a cars radiator gets past this type of closed system heating by external cooling, which would be the radiator & cooling fan blowing cool air into the cooling fins.

Ya cant cheat the system on cooling.

The proper instalation of this method would be to bring fresh air in from an ajoining room or basement,supply this cool air to the intake side of the cool tube then exhaust the heated air from the other end of the cool tube into the attic or outdoors,a closed loop system will only generate more heat.

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My 4 day $40 bud dryer,http://www.rollitup.org/grow-room-de...ml#post2087235My DIY $3 Carbon filter,http://www.rollitup.org/grow-room-de...on-filter.html

that's exactly what I needed to know. I have an adjoining closet I can extract cool air from and then run it to my attic. I would imagine thermal imaging or flir or whatever it is called isnt something I need to worry about if I am venting to the attic...so I think I am all set...thanks again panhead

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