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Tips for cooling down grow tent?

Quick update. Tent is showing 76F now with 56% humidity. This is a lousy photo I took tonight with my cheapo USB magnifier, think it's time to cut her? She's at 9 weeks. I'm thinking it's time to put her out of hee misery and move the two auto plants to the larger tent.

I really need to get a better cam for this stuff.
 

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If you’re super desperate look up some DIY swamp coolers. I’ve made a few with five gallon buckets. They will drop temps, for a small space it could work.
The humidity will cause issues worse than the stress from heat.
. The room is on the 2nd floor and the
There's a clue. Heat rises, your second floor is warmer. I'd run a 4" flex line to the register in that room and draw cooler air from a lower point in the house. Set the duct in front of the register, and seal it with a lump of towels. Bonus points to use a 4" inline to actively draw the cooler air from lower parts of the dwelling.
 
Quick update. Tent is showing 76F now with 56% humidity. This is a lousy photo I took tonight with my cheapo USB magnifier, think it's time to cut her? She's at 9 weeks. I'm thinking it's time to put her out of hee misery and move the two auto plants to the larger tent.

I really need to get a better cam for this stuff.

The second pic is good focus, but that looks like a sugar leaf. Those mature much earlier than flower glands. Can you scope some glands on a calyx?
 
Quick update. Tent is showing 76F now with 56% humidity. This is a lousy photo I took tonight with my cheapo USB magnifier, think it's time to cut her? She's at 9 weeks. I'm thinking it's time to put her out of hee misery and move the two auto plants to the larger tent.

I really need to get a better cam for this stuff.
Easy and best scope money can buy. I’d you have a smart phone that is but most do nowadays. Amazon.com/60xclipscope
 
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What side of the house is this room on, in terms of being south, north etc facing? If the side of the house the window is on gets shade all day, i'd just crack that window open and drill a board flat against it on the outside, with a 45 degree top edge for water to still run off in storms...and just pop a hole in that for an ac infinity damper (they are pretty air tight and sturdy)..but i think I'm not familiar with your window type sorry, i'm thinking like an oldschool sliding up and down window with those weights hidden in the side-jams.

if it weren't the second floor, I'd say just vent from your crawl space with a decent air filter...just cool the whole room down from the crawl space and the tent will follow behind. If the room below that isn't an important room you could just send a second duct through it vertically to the floor and make second hole. another option is dig a 8 foot deep pit outside, cover it, vent from there up to the second floor. If you keep the pit moist it'll drop another ~20 degrees.

another thought is just make sure the tent/room has an exhaust somewhere near the ceiling/top, pulling heated air that rises out...as a bare minimum this should help drop temps... dimming down lights if that is an option until the heat wave passes...

Running things at night too, put them to sleep during daylight hours of peak heat
 
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What side of the house is this room on, in terms of being south, north etc facing? If the side of the house the window is on gets shade all day, i'd just crack that window open and drill a board flat against it on the outside, with a 45 degree top edge for water to still run off in storms...and just pop a hole in that for an ac infinity damper (they are pretty air tight and sturdy)..but i think I'm not familiar with your window type sorry, i'm thinking like an oldschool sliding up and down window with those weights hidden in the side-jams.

if it weren't the second floor, I'd say just vent from your crawl space with a decent air filter...just cool the whole room down from the crawl space and the tent will follow behind. If the room below that isn't an important room you could just send a second duct through it vertically to the floor and make second hole. another option is dig a 8 foot deep pit outside, cover it, vent from there up to the second floor. If you keep the pit moist it'll drop another ~20 degrees.

another thought is just make sure the tent/room has an exhaust somewhere near the ceiling/top, pulling heated air that rises out...as a bare minimum this should help drop temps... dimming down lights if that is an option until the heat wave passes...

Running things at night too, put them to sleep during daylight hours of peak heat
It on the second floor of the north side. I can't open the window because it's a casement window that's in a small alcove that is completely filled with the grow tent, so I can't reach the window. At least the sun's not coming in on that side. However, perhaps you missed my later update, and my serious facepalm. During the winter the room can be a bit cool for growing, so I put heat mats under the pots and I completely forgot to unplug them when summer arrived. It should have been able to handle the air temp in the tent in the 80s, but the plant was baking from the bottom up. Those roots were roasting. I now have a couple auto plants in there that will finish in about 2 weeks and the tent environment is much better.
 
It on the second floor of the north side. I can't open the window because it's a casement window that's in a small alcove that is completely filled with the grow tent, so I can't reach the window. At least the sun's not coming in on that side. However, perhaps you missed my later update, and my serious facepalm. During the winter the room can be a bit cool for growing, so I put heat mats under the pots and I completely forgot to unplug them when summer arrived. It should have been able to handle the air temp in the tent in the 80s, but the plant was baking from the bottom up. Those roots were roasting. I now have a couple auto plants in there that will finish in about 2 weeks and the tent environment is much better.

🙃skimmed too fast, nice it was just those heat mats!
My old outlet was like that, inaccessible from the bed in the way (especially once things got big), and it had to go there. Even automated it with some bluetooth controls+damper so i didn't have to ever get back there. But my bed was getting too cold near the floor in the winter, even with good ambient temps so I made a dolly to raise it up a foot for the heat to reach under. and that exhaust setup was in the way yet again, so sealed it off and found a dif outlet spot eventually up high. I don't have to stoop so low trimming now, can rotate/move it when i drop scissors or spill soil/trimmings behind. but my little 24x24x36 wooden shanty box is stuck in place, want to put that on dolly wheels so it's like a rolling cab- and plop one of those 24"x24" ac infinity tents on top of it as an upgrade. It'd have a nice warm bottom from the cab below probably. I'm rambling now... but do those tents only unzip on one face or can you access it from the back too, if say I was to spin it around? For me, after 5 minutes it gets to be a pain in the neck reaching around in the back of a 2 foot space.
Reaching James Horner GIF
 
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🙃skimmed too fast, nice it was just those heat mats!
My old outlet was like that, inaccessible from the bed in the way (especially once things got big), and it had to go there. Even automated it with some bluetooth controls+damper so i didn't have to ever get back there. But my bed was getting too cold near the floor in the winter, even with good ambient temps so I made a dolly to raise it up a foot for the heat to reach under. and that exhaust setup was in the way yet again, so sealed it off and found a dif outlet spot eventually up high. I don't have to stoop so low trimming now, can rotate/move it when i drop scissors or spill soil/trimmings behind. but my little 24x24x36 wooden shanty box is stuck in place, want to put that on dolly wheels so it's like a rolling cab- and plop one of those 24"x24" ac infinity tents on top of it as an upgrade. It'd have a nice warm bottom from the cab below probably. I'm rambling now... but do those tents only unzip on one face or can you access it from the back too, if say I was to spin it around? For me, after 5 minutes it gets to be a pain in the neck reaching around in the back of a 2 foot space.
Reaching James Horner GIF
Unfortunately, this tent only has one door. I suppose that's not too surprising since it's only 3x3 and easy to reach across from the one. Outlets are another issue. I only have one in that room to run both tents (the second one is 2x2). Thankfully, neither the fans nor the LED quantum board lights for those small tents draw too much power. Even those heat mats are low wattage. But with those danged mats dealt with, I should be good now and this whole thread now stands as testament to my thick skull. 🤪
 

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