Dehumidifiers How Much Do They Effect Relative Humidity? +Rep for Your Knowledge

Just exactly how much water is in the air? If a 10x10 room is 75 degrees, how much does the RH change if 10 pints are taken out of the air. All the dehumidifiers are measured in pints removed daily, but that means nothing to me. It might as well be written in Japanese.

Personally my flower room is 10'x12'x9'. There are constantly intake and exhaust fans on. The RH is usually around 55% but the last few days have been very humid so it's in the mid 60's. I don't know what size to get.

If anyone can help me here I will rep the shit outta you. Thanks.

~Stoner Smurf

I'm relatively new, but am running a very small sealed room in a basement in a humid state so I have humidity issues already My room has no intake or exhaust fans (except for the air cooled lights which is a closed loop system, doesn't vent into the room at all)...so when the plants transpire moisture into the air, it creates a very humid environment in my room.

I researched Dehumidifiers and ended up buying 2 Danby DDR7009REE from some Allergy website for like $270 each. I stuck one in the room and the other outside the room in the other portion of our basement.

http://www.danby.com/product/DDR7009REE/12

They work great. Consumer Reports rated them #1..thats why I bought it. Took my humidity inthe room from 80's down to high 40's, low 50's. Which is very acceptable.

The Danby dehumidifier is expensive, but the 70 pint per day capacity is the highest out there for normal dehumidifiers unless you want to buy some super expensive, badass commercial dehumidifier for over a grand. So as for what size to get, I'd just get the 70 pint one. That way it can handle anything you throw at it compared to something underpowered. The Danby line were all about the same physical size, and drew about the same amount of power, so I just went with the 70 pinters (biggest they make) and am glad I did.

It has continuous drain and low temp abilities and I'm running it continuous drain. You can use a condensate pump to run it continusously and pump the water from a bucket or from the pump itself to a drain or sink or bathtub or whatever you can drain it into. I'd plan on it running continuously if you have humidity issues. So plan on where you want to dump the drain water and how you want to deal with it (pump, direct drain, bathtub, sink, etc).

Stoner, that really depends. The dehumidifier will continue to work an pull water from the air as long as the res is not full unless you run a hose/pump like xivex. Mine is next to a crawl space and it's an issue in there all year round. How much it lowers the RH depends on the room conditions to start with. If my heat/ac was in this part of the house it would help but it's not. How much water are you introducing into the area is another factor. I get about a 10-12% swing from the machine. They do generate a fair amount of heat and will push the room temps a few deg, I run the lights at night and the dehumid during the day in an effort to keep the temps down. I hope this helps some, good luck!

I have an amana 65 pint that runs 24/7 in my basement and my humidity never gets below 40%.the space is around 15x30 with 8' ceiling,its very damp down there and the dehumidifyer works well but it also raises my temps alot.if yours doesnt have to run 24/7 then heat may not be a problem,I would buy the biggest 1 you can afford,I got mine on ebay for 150 bucks shipped to my door,another consideration is power draw,mine draws 6.7 amps and if you can hook it up to drain with a hose so you dont have to worry about it shutting off when the tank is full will be a plus,its a pain in the ass emptying it every day. good luck

A lot of the 'residential' dehumidifiers that you'll find at your big-box hardware stores are just plain inefficient and cannot keep up with your humidity demands. I have an LG 65 pint dehumidifier that would run 24 hours a day, pump out hot air, and only take about 5% humidity out of the room (70% down to 65% RH). I had to upgrade to a commercial grade dehumidifier that can take out 200 pints per day because the LG was creating more issues than it was worth. The commercial grade unit is set at a specific humidity level, hardly ever runs, and has no trouble keeping my humidity at or below 55%. You pay for what you get. Might I suggest this site for quality units:

http://www.sylvane.com/dehumidifiers.html

The level of unit you will need depends on how many plants you're running. The transpiration process of a larger grow area can present an environment that will burn out residential grade units in under 12 months. Buy bigger than you think you'll need. Good luck!

I am with Homebrewer. I also didn't cheap out (I could have gotten one from Wally world for $80.00) and got a unit that allows me to set the humidity level and creates very little heat when it runs because it is efficient. Mine also has a flange on it that allows it to connect directly into my sewer drain. I haven't been ambitious enough to do that yet as it isn't that big a deal to empty the bucket once a week.