Dehumidifier 4 greenhouse

[Budwiser69]

I have a 5000 cubic foot dehumidifier and a couple of box fans for a 10X9X8’ greenhouse. Does anyone think that is overkill for humidity? The daytime temperature in the Blue Ridge mountains can reach 85 degrees or better in July and August. The humidity can soar to 90 percent. My deepest fear is bud rot.

[DEEPDIVERDAVE]

Forum contributor (me) posted this on fifferent thread.

which led to another contributor posted this:

@Ickey

Indoor Garden Air Circulation Setup

There are several tools which make it a breeze to monitor and control your humidity and temperature, but the gadgets are only as helpful as the actual sense behind the setup. A fan doesn’t do any good if it’s not pointed at something, right? That’s a fairly silly example, but it illustrates a point: your setup has to be, well, set up. You’ll get decent results if you do a decent job, but to get excellent results you have to think it out. For example, let’s say you need to ventilate the excess humid air from your tent. Opening your vents is a solution, but it’s not the best one. What you really need in this situation is an exhaust system, which is much less expensive or intimidating than it sounds. A simple duct fan is all you really need for smaller spaces like a tent – just put it right in your tent’s vent port (preferably one that’s higher up) and you’re set, it’ll suck unwanted air out of your tent and as long as you leave an open vent on the other side, fresh air will replace it. If you do it this way, just be aware that the open vent should be covered with a filter of some sort to prevent pests and mold from coming in with the fresh air.

@Ickey posted more under the thread

Ac infinity duct fan

My friend gave me his old 4 in ac infinity with the temp screen and I wanna know if it will do good in my 4x4 because I have a 8in duct fan and it works to good and creates a lot of negative pressure

Seven years and going strong. Would operate better, with drain plumbing vice monkey dumping buckets.

[DEEPDIVERDAVE]

@Budwiser69

Does anyone think that is overkill for humidity?

Unit has control dials for %RH range control ?
Water (created from cooling operation) drains where?
Automatically drainage or bucket requires dumping for continous operation?
Just asking, for a friend. If it works GREAT.

[Budwiser69]

My dehumidifier has a reservoir of a gallon. I plan to recycle the water for the plants. It is supposed to extract 30 pints in 24 hours. I’ll monitor the ph, but I’m thinking water from air should be ok to use.

[DEEPDIVERDAVE]

If you need more, these models would have my vote, especially if reservoir can have auto drain (into bucket for use, you said.

[beardless]

Overkill - hard to say.
My indoor grow space is approx 160 sq ft. The space is tied to he main HVAC system. I run a 30pt dehumidifier and a portable AC unit (either on cool or dehumidify setting) Mid May to Sept??. Plants can produce a lot moisture

[Budwiser69]

I picked up a brand new dehumidifier for $122. I have a couple of fans to cool the greenhouse during the summer heat. I think I’ll be okay. I just don’t want to create a desert climate.

[DEEPDIVERDAVE]

Jacuzzi or hot tub, add moisture. Good growing to you. I completed my first outdoor summer grow and I am thrilled or addicted.

[DEEPDIVERDAVE]

@Budwiser69

extract 30 pints in 24 hours.

More, sooner, I am told by friends using mine after recent PNW flooding.

[DukeHale]

so i use my bedroom as the lung room for a 4x4 tent. im flowering and had to buy a second dehumidifier because the humidity has been 70-92% RH outside. It effects my room a lot. i couldn’t get the humidity under 70% RH without a second unit and now i am getting by in low 50%RH. I have the sides of tent draped over the dehumidifiers so that they are blowing directly in there also. so nothing is overkill if its outside especially! get one with controls like @DEEPDIVERDAVE said