I used to use a modified camp cooler filled with ice and wet rags. Had a vent on the side, and a bathroom exhaust fan on the top pulling out the cooled air and blowing it on our gals. I'll try to track down a pic.In regards to temps, I'm in Australian summer and have the tent in a garage. I'm quite limited in my accessibility and really lucky to have the tent at all. Not sure how to get the temps lower. Ambient temp outside is 26 celcius, maybe I should draw air in instead of out?
Okay update, I got a second fan for the top of the tent to blow the hot air from the light towards the exhaust. I also disconnected the carbon filter as smell was not an issue. Instantly the temps lowered 2 degrees, I got some reflective material for the top of the tent and now am operating consistently within 25-27 Celsius, with 65-70% RH
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Great job! Thats a lot of good tweaking.
If you are a DIY er you can make a bucket AC with the equipment you already have.
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I have had many plants go 90- or over a 100 days.
When they get stunted they take longer for sure. I have never had the underdevelopment problem you have though. I am not sure whta can be done. I'm thinking that for these plants you can throw good money after bad and never get a big harvest. I would start a couple more, and keep those going with them. Being auto's they can live together just fine. No light schedule problems.
They will likely kick in once all the environmental variables are fixed, but will not achieve full size.