Anyone have experience with these type of dehumidifiers? My dehumidifier struggles to get below 45% during late flower when I drop my night temps to 63’f. Apparently these units are more common in the uk where they get cold temps along with humidity.
https://www.sylvane.com/ecor-pro-epd200pro-dryfan-200-pint-stainless-steel-desiccant-dehumidifier.html
This efficient, rugged desiccant dehumidifier removes 74 pints per day at AHAM and up to 95 pints per day at saturation–equivalent to a 200-pint, less efficient, refrigerant/compressor dehumidifier.
These units work without a compressor and function by collecting humidity with desiccant which is then heated, exhausting moist air out of your grow area. This results in a dehumidifier that runs without producing condensate and doesn’t require plumbing. Since the unit functions without a compressor they can function as low as -4’f. These units also well at low humidity levels, whereas compressor units struggle to get below 40% a desiccant dryer can deliver extreme environmental control as low as 1%RH.
Example diagram
3 Likes
They are used in med to large greenhouse applications. I have seen several and they work well, especially when you want low humidity at low (relative) temp. Oh did I mention they are huge, like 10+ feet for the larger units.
They work amazingly well, but can be expensive to maintain.. this is what ISO clean rooms use in pharma.
@Roguelab
Pretty much nails what you were looking for, no?
2 Likes
Not a direct solution but it can help. These work by taking in 15% of outside air and pushing out 15% of inside air, they dont really work in a closed environment. U will still need a place the air is taken from to help the system work, so u will still need a dry tank/room for the air to be sucked out of.
With that being said, i use these all the time during the winter months, place my compressor dehu in my “dry room” and then suck air from that to the dessicant dehu in another room i need more dry, so its always being fed dry air to dispel out the wet air.
I first started using it as a secondary dry room for mushrooms. Compressor based dehus would do 80% of drying then moved the mushies to the dessicant dehu to get it down to <5% rh.
One reallt good benefit of dessicant dehus is the lack of build up heat in the room, they dont really increase the temp in the room like a compressor dehu does, because it shoots all of its “hot” air outside of the room. It also works when temperatures are really low, so u can theoretically dry a cold room if u wanted. A compressor dehu would struggle with that task
TLDR: highly recommended, fun toy
1 Like
That’s exactly where compressor dehus fall off — at 63°F nights their real pints/day is far below the label rating, so chasing 45% with the same unit won’t work. I’m Paco, a commercial grower for 7 years in NorCal. A batch I worked on, 1,300 plants, came in at 90.4 g/plant. After changing it based on the review model’s data, the actual harvest reached 101.5 g/plant, up over 10%. I’m doing 3 free batch reviews this week for California indoor growers. DM me REVIEW and send me your last batch numbers, and I’ll size your dehu from your actual water use in 48 hours.
