Wtf ac won't keep from cool

jondamon said:

Your AC vent should be directed low, your exhaust should be up high.

Ideally with AC you should ultimately seal your room and run Co2 but it will work as I said.

The only difference is that by exhausting aswell you will obviously loose some of the cool AC air but if you need it to remain a certAin temp without adding Co2 enrichment then how else do you plan to do it?

If you exhaust more than your rooms dimensions of up to 3x per minute once you exceed this 3x then AC is required anyway.

J

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I was think bring air in from the window then through the lights and back out
Then have ac going also, the hopefully they ac would be exchanging air.
Since it blows hot air out?

doubletake said:

I was think bring air in from the window then through the lights and back out
Then have ac going also, the hopefully they ac would be exchanging air.
Since it blows hot air out?

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If you have the lighting system on its own seperated air intake and exhaust then this will help to cool the room down some more.

However if you continue to just dump the exhaust of the lights into the room with the tent in it then this won't work as your ambient room will just heat up more, your AC will work harder to compensate for the increased heat etc.

Portable AC units also release odours from the exhaust duct of the unit.

Not sure how well it would work to also exchange the air in the grow if you sealed off the lighting rig.

One thing I could say for sure is if you cooled the ambient room with the AC, exhausted your tent out of the ambient room in the normal fashion then temps should be good.

So to sum up
1. Exhaust grow tent air out of ambient room.

2. Cool ambient room with the portable AC.

Negative pressure will keep cool air coming in through any open duct ports on your tent.



J

spek9 said:

Can you tell if you have negative pressure in the tent?

-spek

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doubletake said:

Yea man it's like a suction cup I have a 340 cfm inline fan and it seems powerful enough I'm thinking ac unit needs to be in the tent huh?

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If your tent is a big suction cup, or a vacuum chamber, you aren't bringing enough of the cooler air into the tent.

My 4x4 is hanging 2 400 watt vented hoods the temps dropped from 85 to mid 70 ' when I bought a 12,000 btu portable ac unit. It is drawn in by 440cfm 6inch fan.... exhaust is also 440cfm. You must flow your exhaust out of the room so intake can continue to drop the temps that you're lights are producing.