[00420]

Originally Posted by Befri

Need some help here:

I have been struggling with a heat issue in my sealed room. Here are the stats:
Basement style grow room 12'x8'x6'8"
I split this room into a VEG(7x8) and flower(5x8)

Veg is T-5 432watt light

Flower is 2-1k air cooled lights(sealed hoods with cool air and exhausting outside the room)

The way my basement was sent up(game room) the a/c that was already there(wall mount 6M btu). So I keep the a/c there and tried to use it. The flower and veg room have 2-6" fans transferring air between each other with a scrubber between the two. So my original thought was to run the 6M btu a/c to try and cool both rooms. That didn't work...the veg stayed ok at 75F but the flower stayed around 90-92F. SO then I went and bought a 15M btu a/c(wall mount) to hang in the flower room. After putting it in....it looked to big. But I figured that I needed the "big" a/c. Well the a/c cycles on and off with both rooms still exchanging air between them two. The only way I can get the rooms to stay stable is run the 15M and the little 6M in both rooms. The reason why is the BIG DOG a/c wont stay on long enough to cool the rooms down. I do have the a/c on low(speed 1) and still no help!

If I did the formula on this thread and adding up all the components between both rooms I'm at 10625 BTU needed. Now that is not counting the DH if needed. I would think the a/c would take care of that. If not I have a 65pint DH on hand if needed.

So should I take the 15M a/c back and get the 12M Btu??

Will I ever get both rooms to stay somewhat stable in the ideal temps??

i would go down to the 12 unless you plan on adding more light

if i remerber right the 65 pint DH is close to a 600 watt light and would bring you up to where u need to be but i dont think u will need to run it if u have the smaller a/c and even if u do run the 12kbtu with the DH u will be fine... whats your RH now?

it's ok for it to kick on & off but not a shit load..... also remember this is just the start of summer so keeping the 15 would not be a bad pick either.... it really comes down to your plans later 12,000 btu will do 3k light most the time but i have seen it do 4 and i have seen it choke with 3....

[Befri]

Thanks for the reply...

My RH runs around 55-60% when lights are on...and 65% when off.

[~Shhh~]

Thanks for the informative thread 00420!

Lemme just check I have this right...

Floor area is - 10 x 7 x 40 = 2800 (A)

Equipment in room:

Fan - 65w
Oscillating fan - 50w
2 x airpumps - 20w
2 x water pumps - 20w

So - 155w x 3.5 = 545 (B)

If ballast kept in room - 2400/2 = 1200w x 3.5 = 4200 (C)

Lighting - 2400 x 4 = 9600 (D)

Occupant - 1 x 400 = 400 (E)

Total load - 17545 Nearest AC BTU size = 18000BTU.

If I remove the ballasts from room, I should be able to use a 14000BTU correct? Will this size AC ensure that it runs throughout the lights on cycle?

How do you maintain night time humidity without a dehu?

Thanks in advance!

[00420]

if u keep the ballast in your room go with the 18... if u take them out go with a 15 that will give u a lil extra push on them 100+ days but yet still able to control your hum by usinging a slower fan speed on the days that it's 75-80

[CandyColas]

Great thread guys. Just a quick question. How do you mount window mounted A/C units inside a home? My grow room is in a spare bedroom but I've sheetrocked over the window and completely lined the inside of the room with poly so there is no access to the window. I wouldn't want to hang a shaker unit from the window anyway as I feel this would be a giveaway to my op. Do you mount it to an inside wall? If so, how do you vent that hot air? What about split A/C units? Are these as efficient as a window mount? I know that they are super quite. At least the part that is inside the room.

Thanks for all the help!

[GorillaGrower]

candy.. if your in a spare bedroom.. the best bet prob would be the window..

usually say if your adding a window unit to a room ..often times the rooms walls were constructed for the op (say in a basement).. you just knock out a hole and frame it up for the A/c. The back of the A/c where the heat comes out.. dumps into spare room (say the laundry area).. but in your case i imagine the whole you make would point the rear of the unit into a bathroom or hallway.. which probably wouldnt go over well.. with the misses.. landlord.. etc.

depending on how many lights your using.. you could do two things beside the window unit in the window... if one light or a modest setup... a portable "could work" and if more lights.. using a mini split would be a perfect solution.. especially if you want that window locked tight.

and yes mini splits are prob the most efficient but most expensive application.. think of a whole house A/c unit but "Mini"

Originally Posted by CandyColas

Great thread guys. Just a quick question. How do you mount window mounted A/C units inside a home? My grow room is in a spare bedroom but I've sheetrocked over the window and completely lined the inside of the room with poly so there is no access to the window. I wouldn't want to hang a shaker unit from the window anyway as I feel this would be a giveaway to my op. Do you mount it to an inside wall? If so, how do you vent that hot air? What about split A/C units? Are these as efficient as a window mount? I know that they are super quite. At least the part that is inside the room.

Thanks for all the help!

Check out hoosierdaddys thread on building ac boxes. That thread is golden.
As for mini-splits, I have a 9k btu unit that has heat mode and uses inverter technology and was delivered to my door complete (and I mean complete-pre charged with r410, line set with flared connections so all you need are wrenches instead of soldering, power lines, etc) for $1100.
I can tell you from experience that mini splits are ultra efficient, especially the ones with inverter.
Hope this helps...Evl

[CandyColas]

Originally Posted by Guest

Check out hoosierdaddys thread on building ac boxes. That thread is golden.
As for mini-splits, I have a 9k btu unit that has heat mode and uses inverter technology and was delivered to my door complete (and I mean complete-pre charged with r410, line set with flared connections so all you need are wrenches instead of soldering, power lines, etc) for $1100.
I can tell you from experience that mini splits are ultra efficient, especially the ones with inverter.
Hope this helps...Evl

Evl,

You're the man. That's twice you've helped me out in the last 2 days. What brand and model is that split? That sounds like a great deal. I've been looking on my local craigslist and have found some pretty cheap split systems but I'd assume that they need to be recharged and the installation can probably be a pain in the ass for a used system. I'm going to have to check out this ac box for sure though. I found a good 10k BTU window shaker for $100 that I might pick up.

Thanks again bro!

.

those splits are hot shit.. i love them..

great thread.