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why does my mini split in heater mode raises RH?

Snook

Still Learning
http://www.homedepot.com/p/Frigidaire-Energy-Star-70-Pint-Dehumidifier-FAD704DWD/206734553
I been using this one (after allot of research) for 3 years. set it and forget it.. but youd have to pipe the condensate from that much humidity to some where like a 55 gallon drum..
But if youre ina tent/cab that's ina ACed room youre gonna need one of these too:
https://www.amazon.com/Titan-Controls-702605-Dehumidify-Controller/dp/B002GUSJF0/166-7719390-8889137?ie=UTF8&keywords=titan%20eos1&qid=1459334149&ref_=sr_1_1&sr=8-1
cause you will want the RH in the tent/cab to be 60% not in the room. or put the dehuey in the tent.. its bigger
 

zizration

Member
i wonder if i ran the mini split long enough in heater mode, if it would dry off that could and stop raising the humidity? only one way to find out i guess. don't want to mess w RH while girls are in there really tho and no where to move them for a test ... may have to wait awhile for this answer...

i did get a second larger dehum in there and so far that seems to be helping..
 

zizration

Member
Would turning your exhaust up a little more at night bring the RH down?




that's totally what i thought too. so i ran my 12" max fan at night. the problem was it made it too cold in there as it would draw cool air in while exhausting.


so now it was too cold at nite and the RH was too high. :(

last nite i turned off the exhaust , i put a small space heater in there on low and ran the 50 pint dehumidifier. i just checked , my lites don't go on until 7 am. and the temp was 74f and RH was 55%. pretty sweet nite time conditions for now i'd say...:)
 

BrainSellz

Active member
Veteran
Rite on. I'm dealing with something similar, however I can't turn my exhaust off. I had to put an oil heater in the room and turn all intake/outtake exhausts on low. Glad to hear your temp and RH is word again.
 

zizration

Member
a good degum will get at that RH nicely. i was using a 15 yr old 30 pint/day unit until yday. now i am running a newer 50 pint/ day unit. makes a big difference..:)
 

corky1968

Active member
Veteran
The higher the temperature the more water vapor it can hold.

That's why when the temperature drops condensation occurs.
 

zizration

Member
The higher the temperature the more water vapor it can hold.

That's why when the temperature drops condensation occurs.




well that is totally true. i don't like my day time and nite temps to differ by more than a few degrees. i augment at nite to try an match day time temps. (max 76f)
 

Snook

Still Learning
well that is totally true. i don't like my day time and nite temps to differ by more than a few degrees. i augment at nite to try an match day time temps. (max 76f)
I always thought that a up to 10 degrees lower differential during lights out was preferred..
 

zizration

Member
yea i have heard that as well. i try and keep them within 5 degrees or less swing.. last nite it actually went up 2degrees f :( , i have to get a better temp control on my space heater. RH was 50% tho, so i got that going for me..
 

Snook

Still Learning
there are so many ways to effect yield and are so easy to overlook or not recognize... and then theres the change of the seasons... I stopped growing at night because the 'constant' is easier to keep at night in the winter.. household ac doesn't go on in the daytime and in the winter heat at night.. took me years to figure it out.. I kept with the idea of cooler at night... somewhere, yes, where i'm at in Florida, I like day time.. but good luck with your dilemma, you seem to be getting it under control..
 

Snook

Still Learning
yea i have heard that as well. i try and keep them within 5 degrees or less swing.. last nite it actually went up 2degrees f :( , i have to get a better temp control on my space heater. RH was 50% tho, so i got that going for me..
i'm thinking temps going up at night is not good either ziz.. PM, bud rot?? sumtin.
 

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