No intake/exhaust -- no A/C...possible?

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sweetcheekz

Active Member
Hello all...I'm still constructing my new room in a basement. 8x8 (just for the flower)

It'll have an inch of sheetrock and 3.5" insulation.

Sealed room with 2 x Air cooled 1000w HPS..2 oscillating fans (is 2 enough?)....dehumidifier....pumping co2.

I will have the exhaust for lights, but no exhaust for the room. Hopefully room will be airtight. If my room can stay 70-80 on it's own, do I need to have the AC unit at all...for some form of exhaust purpose?

I live in the PNW and have a very well insulated basement...and a well insulated room inside that insulated basement, so I think keeping temps stable should be easy (if they're too hot, I'll just get an AC unit...no biggie).

I'm just wondering if you need the AC for some form of exhaust...not just for the cooling effect.

Thanks in advance.
 
johnman2880

johnman2880

Active Member
not really although you do need a steady supply of fresh air.if the temps stay constant and no higher than 80 you should be fine but i would definetly have an intake fan drawing air into the room and use your cooled lights as the exhaust side running into an air scrubber so noone smells your girls unless thats not a problem then just vent it out a window or something.If you have high humidity an ac unit will knock it down for budding.
 
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sweetcheekz

Active Member
I've heard...not experienced....that as long as you bring in a constant supply of co2, you don't need fresh air.....which is why I was not planning on having exhaust at all (just for cooling light...which won't touch the room)
I was just wondering if whoever said that (there have been a few) meant that you don't need a "real" exhaust...because the AC does it for you....or if you don't need one period.
 
jaybee007

jaybee007

Well-Known Member
sweetcheekz said:
I've heard...not experienced....that as long as you bring in a constant supply of co2, you don't need fresh air.....which is why I was not planning on having exhaust at all (just for cooling light...which won't touch the room)
Click to expand...
Exactly u answered ur own question lol
Keep the room sealed when using co2
R u pushing the air thru the cool tubes
Aswell as sucking it out the other end ?
I think as long as u can keep the moving fast enuff
U should b ok
 
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sweetcheekz

Active Member
Hey there, thanks to you both for answering. I guess I'll just not exhaust and not A/C for now. I prob won't flower till summer...and doubt I'll have heat issues in winter in the PDX area.

For cooling the lights....I'm still deciding the method. I'd imagine that pulling is more efficient seeing as how theirs less resistance....but not sure? My lights are going to be side by side, so what would be the best method....having one ducting unit coming from one room, going through one light....bending to go back through the other light...then through wall? Or two intake holes side by side....one going into each light...and the ducting comes to a "y" at the end and exhausts together? I hope I explained those scenarios correctly lol.
If I did the "y" method...would I need one fan pulling and two fans pushing....or just one big fan pulling?
If I did the other method...is that too big a turn on ducting? (its gotta do two 180s).


Also...how important is it to keep ballasts outside of the flower room? Will they raise the temp of room significantly? Only reason I want them in the room is to not have to hassle with more wiring. My "home run" is set for ballasts inside room...unless the cord from the light to ballast is like....12 ft?
 
jaybee007

jaybee007

Well-Known Member
2 b honestvu wanna keep the ducting as straight as poss
I would use 2 fans
1 pushing and1 pulling
And yes the ballasts will deffo bring ur temps up
Air cool them with a fan if u have 2 keep um in there mate
But saying that is only 2
 
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sweetcheekz

Active Member
Ok thanks, then maybe I'll do separate ducting for each light...running into a Y to exhaust, 2 cheap fans to push (semi cheap...not real cheap) and one real powerful to pull. I'll also just deal with wiring and put ballasts outside.
Thanks for all the help!
 
jaybee007

jaybee007

Well-Known Member
No problem glad I could help
Believe me I'm no expert lol
Every1s gotta start some where
Good luck
 
johnman2880

johnman2880

Active Member
sweetcheekz said:
Hey there, thanks to you both for answering. I guess I'll just not exhaust and not A/C for now. I prob won't flower till summer...and doubt I'll have heat issues in winter in the PDX area.

For cooling the lights....I'm still deciding the method. I'd imagine that pulling is more efficient seeing as how theirs less resistance....but not sure? My lights are going to be side by side, so what would be the best method....having one ducting unit coming from one room, going through one light....bending to go back through the other light...then through wall? Or two intake holes side by side....one going into each light...and the ducting comes to a "y" at the end and exhausts together? I hope I explained those scenarios correctly lol.
If I did the "y" method...would I need one fan pulling and two fans pushing....or just one big fan pulling?
If I did the other method...is that too big a turn on ducting? (its gotta do two 180s).


Also...how important is it to keep ballasts outside of the flower room? Will they raise the temp of room significantly? Only reason I want them in the room is to not have to hassle with more wiring. My "home run" is set for ballasts inside room...unless the cord from the light to ballast is like....12 ft?
Click to expand...
My bad i didnt see the co2 supply.then yes you will be fine with your setup since your supplying brother.good luck to you hope it works out!
 
*BUDS

*BUDS

Well-Known Member
sweetcheekz said:
Ok thanks, then maybe I'll do separate ducting for each light...running into a Y to exhaust, 2 cheap fans to push (semi cheap...not real cheap) and one real powerful to pull. I'll also just deal with wiring and put ballasts outside.
Thanks for all the help!
Click to expand...
Sounds good but why cant you have a seperate room exhaust with passive intake running next to the cooltube exhaust? You will have to dump the old used co2 and humid stale air outside the grow area. Also run all exhausts out of the surrounding grow area.
 
jaybee007

jaybee007

Well-Known Member
*BUDS said:
Sounds good but why cant you have a seperate room exhaust with passive intake running next to the cooltube exhaust? You will have to dump the old used co2 and humid stale air outside the grow area. Also run all exhausts out of the surrounding grow area.
Click to expand...
A very valid point and 1 I over looked lol
 
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sweetcheekz

Active Member
I CAN have a room exhaust if needed. I just would prefer not to if not needed. So I do have to exhaust out the old air? What's considered passive intake...just a non-powered hole...or a low-powered fan? How often would I have to exhaust room?

I'm trying to add a picture...but it keeps telling me it's in the wrong format and won't upload (it's jpg).

This is what I'm thinking for room so far. Does link work?
http://imageshack.us/f/16/roomlayout1.png/
 
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