I need some wisdom to help cool my grow room!

The deets…

This is a 6x10x7ft tall insulated (used to be cold storage room) room. it’s in my basement and I can keep basement temps any temp I want (I keep it at 68 to 71f for the propagation area).

I have a 6" ac infinity exhaust (short 2 ft run), and have a 4" ac infinity being used as an intake for troubleshooting purposes.

I have a tower fan, 16" and two 8" blizzards.

The RH here is about 38%, and i use a humidifier to bump it to 45 or 50%.

I have a 650 watt and 550w bar light (and keep drivers outside the room.

The daytime temps stay between 82 and 86f, so id like to get these temps down in this flowering room a few degrees to about 70-77f. I run my 6" out fan on 5 or 10 and the temp stays the same. if I open the door a ft it drops fast to 77f, which id be happy with.

I don’t want to install AC for multiple reasons.

I have a 6" duct fan on order but I worry if the 4" ac infinity isn’t doing it the 6" won’t either? any ideas? I have an 8"x15" passive air intake, but the room still went to 85f.

Thanks in advance.

Hi. From what I can see in your pics, it looks like your exhaust is above and close to where your humidifier and intake is. Where is it exhausting and where is it pulling fresh air from, externally? Or is the intake by the door?

I am thinking if you extend your intake further from the exhaust, then your cool(er) intake will not get sucked right out.

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The exhaust is on the top at NE side of the room, it dumps into the furnace room. The air intake is pulled from the west wall on the bottom. The intake air is coming from what used to be a freezer room without any heater ducts, but my grow tent (5x5) in there keep it’s at the ambient basement temp, which I keep around 68 or 70f. So its pulling in air from the freezer room.

Nice setup. You say if you leave the door ajar about a foot, temps are more to your liking. Is the passive intake separate from the 4"? I’m just thinking out loud here but maybe the 6" would be better in your setup. Or make the passive active. Just my opinion of course.

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If the intake is inside the basement you could possibly cool it down by lowering the basement temps down to 60 degrees and the lights should bring it up to around 70 degrees. Only other idea I have would be getting air vented directly from outside (if not already), being the time of year the temps should be pretty low depending where you live.

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I figured it out (I think), I’m going to run a vent from my entrance room to my lung room, entrance gets flooded with fresh air every time someone enters or leaves the house and I can keep it any temp I want.

Thanks!

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