Trying to Get Steady Humidity in Dry Shed

Hey Everyone,

I built a drying shed in my back yard to dry my most recent outdoor harvest. Is is built out of 2x4s and 4’ x 8’ plywood. Overall dimensions are 8’ wide x 4’ depth x 8’ tall, so 32 square foot and 256 ft3.

Right now I have 1 plant drying with an oscillating fan, AC Infinity T6 exhaust fan, Carbon Filter for the T6, Dehumidifier, and small AC to regulate the temp. The AC does a great job keeping the temp between 62°F and 68°F, but i am having trouble with the dehumidifier. It is a GE 35 pint portable dehumidifier, which is rated for around 800 sq ft. My humidity is set to 55% on the controller, however, it continues to oscillate from around 52% to 72% humidity. I thought it might be the poor craftsmanship of the shed and because there are small cracks in the seams and when the exhaust fan/filter turn on it would bring in more humidity (coastal Southern California environment), but I have added foam in those cracks and i am still getting crazy swings. I have never used a controller before so i am wondering if my setup is off or what i might be able to do to fix the large swings. A pic of the chart from the app.

I cut the plant down yesterday, so have time to adjust. I also did a bud wash for the first time, so maybe I just need to wait an extra day or two for it to regulate. If you guys want any more pics or information I’m happy to provide it. Any help is much appreciated!

Cool setup you built @nolsmith , bet you’ll be growing in it before it’s over :grin:. It would be better to not have the T6 exhausting because it will draw in the same amount of air it pushes out. Instead use the T6 to recirculate inside the space only, it will clean the odor that way without drawing in outside air. I’d have the intake at ceiling level and outlet at floor to reduce the amount of air flow hitting the drying buds. I would have it set to ON at as low speed as possible to get the affect your looking for.
If the A/C is the portable type and it vents outside, then it will draw in air also. If your A/C is a window unit with a fresh air vent then close that off. If it has an auto/on function for the fan, set it to auto so it doesn’t draw in humidity when the mechanical cooling is satisfied on temperature.
I would leave the S6 on full time also unless you feel the relocated T6 now provides enough air movement inside the space. It doesn’t take a lot of air movement to create the gentle flow needed to reduce the possibility of mold developing, plus high airflow will speed drying time. Hope it goes well for ya.