Air-Conditioner, what RH level will it provide?

[420tric]

I live in perpetual high heat (~85f/30C) + high relative humidity (80-95%) 24/7/365.
I have a room that is roughly 10'x15' and 8' tall.
I have a 12,000 BTU split Air unit installed.

I will have to run the A/C unit 24/7 to keep a lid on the heat, the heat never drops even in the night, because the house is a concrete box with no insulation, and really poor air flow, so can't even open a window to get some evening air into the house.

What kind of RH levels can i expect from running an A/C all day/night

I am considering adding a dehumidifier also, just to be 100% sure. I wonder how many pints per day would be enough for that room, considering it was already being helped by the A/C I am currently looking at two different models. One model uses 330W and can draw about 35 pints/day, another uses 230W and can draw about 25 pints/day. There are of course some ~600W models that do about 80 pints/day... I am working on the "assumption" that a bigger W value will use more electric, if anyone feels this is wrong, please let me know, i understand sometimes more powerful equipment "works less" so in the end works out cheaper... not sure about this situation

Any thoughts, feedback, tips, knowledge will be very much appreciated. I just arrived here from another forum where people were not really answering threads, this place rocks!


ps. I have ordered a RH monitor, but it is over a week away from reaching me...

 

[Sir.Ganga]

its going to depend on how many and how much your plants transpire. The fuller the room the more moisture, basically. I would buy the biggest de-humidifier you can, control of R/H is a critical part of growing. I run an 80litre unit all year long and use a second 80 litre in the summer months. How many lights will you be using?

 

[420tric]

Sorry i did miss a couple of vital bit of info.

I am using LED lights, right now 300W, maybe add a few more.

Only 3-4 plants, not like i am filling the room.

Some in soil, some in DWC buckets.

 

[mtlhaze]

While in veg you can have humidity higher and be fine. Test the ac unit and watch for spikes in the RH. If you live in a high humid climate I'm sure you will need a dehumidifier in which case you should definitely buy the biggest you can. remember when they are mature and dense the RH will go up a lot more and RH control is very crucial at this stage.

 

[420tric]

While in veg you can have humidity higher and be fine. Test the ac unit and watch for spikes in the RH. If you live in a high humid climate I'm sure you will need a dehumidifier in which case you should definitely buy the biggest you can. remember when they are mature and dense the RH will go up a lot more and RH control is very crucial at this stage.

OK, that sounds like a great plan, thanks. I have a simple monitor coming soon, and then i can see if i will get a dehuey... i think i will.

 

[420tric]

Well i purchased 2 cheap digital temp/humidity monitors, and my room can maintain an easy 40-55% by running the A/C 24/7.

Looks like, for now at least, i do not need a dehuey.

 

[vilify]

my 9,000 btu portable kept my old room near or under 50%. believe it hit a low of about 42%
10x8x8, 10-20 plants at any given time.

recently moved, so i get to see where things stand when i get it all running.