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fridgidaire dehumidifiers

I

itzgrowtime

Member
im usin an old 30pint i believe. Its ancient, and still chuggin away. I havent had any issues so far, but i know when and if it dies. im gonna try to get a larger more efficient one also.
 
S

SCROG McDuck

compost said:
The window AC unit box is great but not really applicable for a dehumidifier. With a window AC unit the outside coils transfer the heat from the inside coils and the box takes the heat farther away from the room. This would mainly be for people who are trying to keep hot air away from the outside of there room or security or what not.

With a dehumidifier the hot air from the coil is what lowers the humidity in the room. As the air passes over the coils it pulls moisture from the air and heats it a little bit. If there is a way around this or a special unit I haven't heard of it yet. Even though an AC unit and dehumidifier operate on the same scientific principle they function way different.

I am kinda curious though do you have a sealed room? If you don't have a sealed room a dehumidifier is really a mute point. If your room is sealed and running CO2 then the room would be able to handle the slightly elevated heat coming from a dehumidifier. Every situation is different.
Click to expand...

I do have CO2 but it's not in use ATM. Good idea though, I'll give it some thought... running a tent with verticl bare bulb... exhaust fan on w light, off with light, so not sealed...

I didn't know/think that it dehumidifies with hot air though..
Thanks for that tidbit. Science.

I was thinking dehumidify the room to 40-45%RH and the tent would settle in at 50-55%.
 
S

SCROG McDuck

LittleAmsterdam said:
both the 70pint and 50pint models contain a "17 Pint Container Capacity"
Click to expand...

I'll bet if you put it on top of a 10-25gal tub and cut a hole in the '17 pint container', 17pints is moot.

Drain to waste somewhere or use a wet vac to suck it out once a week or so.
 
S

SCROG McDuck

compost said:
The window AC unit box is great but not really applicable for a dehumidifier. With a window AC unit the outside coils transfer the heat from the inside coils and the box takes the heat farther away from the room. This would mainly be for people who are trying to keep hot air away from the outside of there room or security or what not.

With a dehumidifier the hot air from the coil is what lowers the humidity in the room. As the air passes over the coils it pulls moisture from the air and heats it a little bit. If there is a way around this or a special unit I haven't heard of it yet. Even though an AC unit and dehumidifier operate on the same scientific principle they function way different.

I am kinda curious though do you have a sealed room? If you don't have a sealed room a dehumidifier is really a mute point. If your room is sealed and running CO2 then the room would be able to handle the slightly elevated heat coming from a dehumidifier. Every situation is different.
Click to expand...

Wait, I missed that... what do you mean about dehumiidify = moot, if not sealed room? You're saying, humidity is ok in non
sealed room? I'm missing somting.
 
C

compost

Member
SCROG McDuck said:
Wait, I missed that... what do you mean about dehumiidify = moot, if not sealed room? You're saying, humidity is ok in non
sealed room? I'm missing somting.
Click to expand...


Every situation is different. If you are exchanging the air in your entire grow room once every few minutes then what matters more then anything is the RH level going into your room. If your house air has 50% RH and is exchanged within the grow room every few minutes there is little you can do to lower your grow room RH save lowering the RH going into the room.

I am not saying high humidity is ok or not okay. In my veg room during the summer most of the time it is over 90% humidity as the room is in constant ventilation with the air outside that has a high RH. However in my flowering room it is sealed so I run a dehumidifier to keep the RH at about 45-50% to keep mold problems down and to encourage plant growth.

One thing I will say is sometimes it is shocking how much RH our plants add to the room. My 512ft3 grow area is sealed very well. It is basically 10 sheets of plywood with great stuff sealing every joint inside and outside. Then I have taped together a layer of the reflective as a vapor barrier. In addition the outside of the wall is the reflective insulation board taped together at the seams with fiberglass insulation in between that and the plywood. I can sit in my grow room during lights out and watch the humidity with the temperature at 76 degrees rise from 40% RH to 55% RH in 2 minutes with outside humidity down below 50%. That is with no exhaust.

If your house is 50% RH or lower your best solution to lowering your tent RH is to increase the CFM that is exhausting the grow room. If you currently run lets say 300 CFM by just upgrading to 400 you are exchanging the more humid grow room air with your house air faster which should lower the RH in your room.
 
S

SCROG McDuck

compost said:
Every situation is different. If you are exchanging the air in your entire grow room once every few minutes then what matters more then anything is the RH level going into your room. If your house air has 50% RH and is exchanged within the grow room every few minutes there is little you can do to lower your grow room RH save lowering the RH going into the room.

I am not saying high humidity is ok or not okay. In my veg room during the summer most of the time it is over 90% humidity as the room is in constant ventilation with the air outside that has a high RH. However in my flowering room it is sealed so I run a dehumidifier to keep the RH at about 45-50% to keep mold problems down and to encourage plant growth.

One thing I will say is sometimes it is shocking how much RH our plants add to the room. My 512ft3 grow area is sealed very well. It is basically 10 sheets of plywood with great stuff sealing every joint inside and outside. Then I have taped together a layer of the reflective as a vapor barrier. In addition the outside of the wall is the reflective insulation board taped together at the seams with fiberglass insulation in between that and the plywood. I can sit in my grow room during lights out and watch the humidity with the temperature at 76 degrees rise from 40% RH to 55% RH in 2 minutes with outside humidity down below 50%. That is with no exhaust.

If your house is 50% RH or lower your best solution to lowering your tent RH is to increase the CFM that is exhausting the grow room. If you currently run lets say 300 CFM by just upgrading to 400 you are exchanging the more humid grow room air with your house air faster which should lower the RH in your room.
Click to expand...

So they say... the tent is 4.9 sq by 7' tall..

I had 1 264 fantec centfiugal xhtng, added another..

!!!!!!!but I didnt add any more 'intake!' DUHH!

Lights come on soon... I'll be back..
thanks for keeping me thinking, compost.. I wasnt before..
It seem that the better I get at this, the more I forget.
 
dunkydunk

dunkydunk

Member
One thing I will say is sometimes it is shocking how much RH our plants add to the room.
Click to expand...

I think my dehuey this time of year is removing almost as much water as the plants drink in a day. I don't think this is mere coincidence.
 
S

SCROG McDuck

dunkydunk said:
I think my dehuey this time of year is removing almost as much water as the plants drink in a day. I don't think this is mere coincidence.
Click to expand...

Check! and if they are looking a little droopy, there's too much RH! NG in bloom.

I'm torn between, cutting a hole in the bedroom wall to mount a window AC
that exhausts into the garage (I think my best option) or the portable AC mambo
and getting a new one every 1.5 years at $400 a pop.. vs the dehumidifier wich could
put me in the same replace every year or two... although the dehumidifier would run alot less than the portable....

I shouldnt do this when hitting on the vaporizer (SSV)
 
LittleAmsterdam

LittleAmsterdam

Member
I use a Dandy DDR7009REE 70pint Dehumidifier. It already has a spicket in the back for a drainage hose. I haven't used the this feature yet....
 
R

RedRain

I use a 65 pint Honeywell, it allows you to bypass the onboard bucket and has a 1/2" attachment for a hose. I collect and reuse the water it draws from the air to water my plants. I never have an issue with my honeywell!!

The problem with relying on your AC's to cool during the night cycle is that there is little or no heat load for the AC's to come on and cool and dehumidify your room. Dehums are a must!
 
G

Guest 18340

LittleAmsterdam said:
I use a Dandy DDR7009REE 70pint Dehumidifier. It already has a spicket in the back for a drainage hose. I haven't used the this feature yet....
Click to expand...
The Frigidaire also has this, on the side. I haven't used it that way either but it's nice knowing I can:)
 
dunkydunk

dunkydunk

Member
I've just been looking into condensate pumps. My circumstances don't allow for simple draining of the dehueys, but I'm thinking the right pump might save me a lot of walking back and forth with buckets.

I do enough of that already.
 
C

compost

Member
evlme2 said:
The Frigidaire also has this, on the side. I haven't used it that way either but it's nice knowing I can:)
Click to expand...


I couldn't imagine life without it lol. Right now I drain into a 5 gallon bucket and have a 18 gallon tote for when I won't be in the room for a few days. With the 5 gallon I atleast have 1 day in the worst humidity before the bucket overflows. I also switch out my 5 gallon bucket every few days with a nice clean one. If you use the bucket that comes with it that is less practical. I don't even have the original bucket in it atm. I have the sensor taped so I can run it without the bucket. The next few days I am gonna use a funnel and some of the extra hose and make a back up drain underneath the connection for the hose.

Watering your plants with the water is huge for me also. I have to take water outside to my room(gonna pipe it out soon) and dispose of it in the same manner. With this I take less water out and have less water to dispose. Also it kinda brings down your waters hardness a bit. I generally mix my dehumidifier water roughly 1 part to 2 parts tap water for my plants. Right now the bucket that catches the runoff from the dehumidifier is right next to my shelves where my blumat res is gonna go. One day I might just put a pump in with a float.

Currently I spray down the coils and filter once a week to try to keep the water cleaner. One day I am gonna incorporate a sanitizer spray into my schedule to keep any harmfuls down. Although I like mixing it with city water to get some clorination into it.
 
R

RedRain

condensate pumps are the shit!!!

I have both my AC's and dehum draining to a condensate pump, then pump the water to my rez.
 
S

SCROG McDuck

Hey redrain and littleamsterdam.. are they noisy? Quiet?
How long have you had them? will they work on a timer?

and RR> thanks for the thought on night time heat load..
something else I didnt concider.

Compost.. RR/LA, thanks...
if the fridgidaire works on a timer.... I'm in.:dance013:
 
C

Carboy

Active member
Picked up the 70pt from Lowes when I needed to get one fast and i 'm really glad its worked so well. After the crisis, have used it in the mother room for a year or 2. Don't even think about it anymore. Quite, re-starts to previous settings w/ power interrupt (don't see why a timer wouldn't work) and a bonus of a little supplemental water w/ the drain hose hooked up. Consumer Report rates it as one of the best choices. Got lucky when I got it --- rarely works that way for me!
As a general rule, I would oversize any dehumidifier. They work much more efficiently if they are just idling most of the time. When the lites go out and you really need it, the capacity is there to get the RH down much faster. CB
 
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