BTU air conditioner question

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saltypimp

Well-Known Member
Hey guys -

I need to know how many BTU's a air conditioner I should get to cool the room with 2 1000 watt HPS systems in there.... my room is 12 x 9 x 8...

My hoods are air cooled with a 6" valueline fan with a reduced jacket to fit the 4" opening on my hoods (rated at 420 cfm, around), hoods also have glass covering....


Edit: also, need to know how many pints of a humidifier sdhould i get for my grow room....35-50 - 65 per 24 hours...

thanks
 
S

saltypimp

Well-Known Member
yeah... I have a intake and exhaust (have on 30 minutes on/30 minutes off (24 hour cycle)... both are rated at 172 CFM (4" valueline fans)
 
rbahadosingh

rbahadosingh

Well-Known Member
thats not enough cfm for venting. if your room is 12x9x8 then thats 864 cubic feet. you should be able to exchange the air 3 times in a minute.
 
jondog123

jondog123

Well-Known Member
rbahadosingh said:
thats not enough cfm for venting. if your room is 12x9x8 then thats 864 cubic feet. you should be able to exchange the air 3 times in a minute.
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He is right. Really, if you have the proper vents and get a high enough cfm fan (at least 750 with 2 1000's) then you shouldn't even have to air condition your room. I would leave the exhaust fans on the whole time your light is on. If you really want to go the a/c route, I would guess minimum of 10k btu's with your current setup.
 
panhead

panhead

Well-Known Member
Double ditto on the ventilation,if i were you i'd invest the cash into more exhaust,at the bare minimum you should be able to move the room air once every 3 minutes,get another 1500 cfm exhaust & cut a passive intake & most likely you wont need to run ac.

When you think about it ac is cash down the toilet & only a last resort,the cash spent on ac can run another 1,000 watt light once temps are under control,ventilation is dirt cheap but ac will kick your energy bill in the nuts.

As for the dehumidifier anything under a 35 pint is like pissing in the wind,dehumidifiers are rated to pull so many pints in a 24 hour period with humidity levels of 80% & room temps of 74 to 80 degrees,the lower the humidity level the less they pull in that 24 hour period,same with temps, the lower the temp the less they pull,if your in a basement with cool night time temps be sure to not buy a standard dehumidifier,get a basement dehumidifier,they cost a little more but they pull alot more moisture because the compressor/condensor is designed to operate at lower air temps over standard dehumidifiers.
 
M

Mebudda

Member
two 1k sodium and two 4x8 T5 ....AC is 10k BTU aprox 6 feet up the wall and has difficulty keeping 80F when all lights on room is 10x10x10, fully wrapped with mylar and a few mirrors tossed in for good measure
 
C

Chalupas

Member
panhead said:
Double ditto on the ventilation,if i were you i'd invest the cash into more exhaust,at the bare minimum you should be able to move the room air once every 3 minutes,get another 1500 cfm exhaust & cut a passive intake & most likely you wont need to run ac.

When you think about it ac is cash down the toilet & only a last resort,the cash spent on ac can run another 1,000 watt light once temps are under control,ventilation is dirt cheap but ac will kick your energy bill in the nuts.

As for the dehumidifier anything under a 35 pint is like pissing in the wind,dehumidifiers are rated to pull so many pints in a 24 hour period with humidity levels of 80% & room temps of 74 to 80 degrees,the lower the humidity level the less they pull in that 24 hour period,same with temps, the lower the temp the less they pull,if your in a basement with cool night time temps be sure to not buy a standard dehumidifier,get a basement dehumidifier,they cost a little more but they pull alot more moisture because the compressor/condensor is designed to operate at lower air temps over standard dehumidifiers.
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If you run that size exhaust fan in that room, do you just run the dehumidifier at times when the exhaust fan is off, or do you run it nonstop and the exhaust nonstop, or what?
 
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