12 x 12 Room HEATING ISSUES NEED HELP

i have a 12 x12 flowering room with 2 1000hps with parobolic hoods a 465cfm fan for intake 720cfm fan for exhaust both intake /exhaust fans come on every 15 min i also have 2 oscillating fans one fan is off during nite and intake/exhaust is off im planning on adding 2 more 1000hps but my temps rite now is getting up to 82degress 55humidity with lights on and down to 71degress 35humidity at nite when my fans come on it doesnt drop temp it jus drops humidity down to 40 i have a humidifier its set at 50% any info is appreciated on how to get temps down and keep 50% humidity. also would like to use co2 later on. any ideas guys NEED HELP THANKS ANY INFO IS APPRECIATED. outside temps are 40 degress

the fans are too small, 12 x 12 x 7 assuming it is 7 feet high is roughly 4 x 4 x 2 metres = 32 metres square x 60 = 1920 divided by 3 is a fan of 640 cmh minimum intake get 8 inch 1015cmh fans with speed control and turn them down igot mine cheap from ebay and when you need the extra boost you can turn them up and use a temperature control computer to regulate the fans and temp, i got one from ebay uk for cheap
http://cgi.ebay.co.uk/TC-10-DIGITAL-THERMOSTAT-HEATING-AND-COOLING-PACKAGE-1-/230595777809?pt=UK_Home_Garden_Hearing_Cooling_Air&hash=item35b0945511 any temp controller is better than no temp controller. that one is a guide only trawl the web and get a cheap one that will suit you, that will turn the fans on when the room gets warm and off when cold.
i have pictures of my fans on this forum under grow room design and set up the thread is i built a secret grow room the series under the post update, what you need is here read it study it and copy it.
the humidity will go crazy because of the heat and air trapped in your room, start with the fans once they are up and running perfectly then look at the humidity, you might see a change as soon as you have done this add the two new lamps.

do you think that would help cause i jus bought those dam fans normal temp when lights out is 72 and what bout losing humidity

Flo Grow said:

Your temps are actually fine at 82F.
If you plan on running CO2, then you'll need temps up to 90F for it to be effective and worthwhile.
When you add those 2 more 1K lights, you'll most def need larger intake and exhaust fans.
Even a big enough passive intake would help and cut electric costs.

Every bend in your ducting is causing a minimum 10% (for 30 degree bend) DECREASE in efficiency for your fans exhaust (pulling).
If your pushing air, it's worse.
Clean, cool air from outside, thru your lights and vented outside your grow room.
Active/passive intake ON THE FLOOR and OPPOSITE your exhaust fan, which should be mounted as high as possible (heat rises).
So vent the lights seperate from the grow room.

Check the Ventilation Calculator link in my sig.
May surprise some ppl.

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his temps might be fine at 82 but to run 4000 watts of lighting thats a big hole for a passive air intake when his exhaust is pushing out 8 cubic metres of air a minute minimum he is better using two fans and venting air in the same way as i did from a sealed hidden window box. (the fans are only 200 watts) 4000 watts from lighting is a huge amount of heat.

explain the chart apart from it being old fashioned and in the old sizes we use square metres hour not square feet minute.
and who needs a chart best to vent in fresh air with an inlet, and exhaust it somewhere to expel in to the atmosphere, his room is 32 metres square, x 60 minutes = 1920 square metres an hour he has to empty his room one third every minute x 60 minutes 1 third of 1920 = 640 cmh that is for fresh air too not just heat presuming the room is full of plants.

fresh air is only 0.039% co2 that is a lot of air to pull co2 from that the plants need, any real problem heat that needs to be expelled during long hot summer days needs a more powerful fan 1015 cmh with a speed control switch and temp computer who needs a chart. sometimes practice makes perfect, passive intakes cannot run at slight negative pressure, cover your room in totally in plastic mylar or megalite, seal it all with tape, do the floor and seal the door with stick on draught weather seal. run the inlet slightly slower than out let and the heavy smell can only go out the exhaust and not drift or leak from your room. you will need a sprung non return damper on the inlet duct that will expel the fumes where someone would smell the fumes if they were drifting out when the fans are off it will spring shut when the fan is not pushing or pulling air through it in to the grow room and shut off that duct.

once you have it running properly you can make a home made co2 kit that you leave on all the time, a sort of yeast home brew in a bottle, at night when your lights are off and there is no heat the plants respire( breathe ) air in the dark ( the opposite of photosynthesis) your fans will be off and your room will build up a nice high co2 content when your home brew is bubbling co2 out, just in time for the lights to switch on and give your plants a little nitrous oxide for breakfast in the morning before the heat builds up and the fans starts to empty the room again, although it will give you a constant slightly higher co2 reading anyway. passive air intakes need to be on constantly with your lights. fan intakes and exhausts can work from a temperature controller.
make home made co2 kit, make it from an

an empty 5 litre bottle.
add 2.5 litres of luke warm water,
half a kilo of sugar
1.5 level teaspoons of dried yeast granules baking stuff will do.
put the lid on and give a good old shake
remove the lid and sit among your plants
this will expell co2 for 7 days although may take 1 day for the fermenting process to start expelling the co2
so get 2 bottles and the day before you have to change the old one on the 6th day get the second one ready
and then replace it on the seventh day.
i know that when fermenting it is better to be dark and warm so paint the entire bottle two coats of a decent black paint to keep out
as much light as possible and put a lid on with small hole in middle.
this will cost you about 1 -2 dollars a week to run.
buy the yeast from ebay in a box and 1 kg of sugar every 2 weeks.
if you were fermenting for longer than 1 week to make alcohol you would need to use brewing yeast which is expensive as bakers yeast breaks down and dies too soon. this produces ethylene alcohol, empty the contents down your toilet flush and clean the old bottle. do not attempt to extract this ethylene it would probably blind you if you drank it.

always remember that all the members on this forum live in different areas of the world with different temperatures some extreme. if we all use an indoor temp computer in our sealed growrooms they will be running roughly the same temps no matter where we are or what extreme weather is outside.
you can get cheap ones that heat and cool lizard terrariums etc, remember that when you use the word hydroponic to buy something on the internet the original price will be doubled or trebled for the same item, wink.

thanks alot that was real good info really about the co2 are you sayin use bakers yeast?

can this co2 be mixed at larger volumes to last longer is this size good for 12x12 room thanks alot that was real good info really about the co2 are you sayin use bakers yeast?[/QUOTE]

reefamadness said:

can this co2 be mixed at larger volumes to last longer is this size good for 12x12 room thanks alot that was real good info really about the co2 are you sayin use bakers yeast?

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[/QUOTE]
yes use bakers yeast for 1 week brew, use 2 x 5 litre bottles placed different places amongst your plants to double up, 1 week is maximum for the high co2 content that the mixture will give off. repeat it weekly. remember that this only works well with the lights off period, ready for light switch on in the morning, or intermitent fans of 15 min on and off fans, no good for constant fans.

ok just mix bottles up and put in room and let stay for a week? do you know about how much co2 this produces? can my oscillating fans stay on ? i found this on site what do you think about this?

1 pound of CO2 should theoretically yield 35 gallons of carbonated water at 100 percent saturation. Thats about 1 cubic foot of gas in 4 gal. An 8'x 8'x 8' room would need 2.64 gal every 4 hour to achieve 1300 ppm CO2. That works out to a little over 330 gallons in a 6 week period.


A pound of sugar will ferment into approximately half a pound of ethyl alcohol (C2H5OH) and half a pound of CO2. One pound of CO2 makes 8.7 cubic feet of CO2 gas at normal atmospheric conditions. In that 8 X 8' X 8' grow room, you will need to generate 512 cu. ft. X .0013 (1300 PPM CO2) = 0.66 cubic feet of CO2 every four hours. It takes time for the yeast to ferment sugar, so the size of container you should use in determined by dividing the cubic feet of growing area (512 Cu. ft.) by 32 = 16 gallons.

To determine how much sugar you need for six weeks of operation or until fermentation ceases, the following calculations are necessary: You need 0.66 cu. ft. of CO2 every four hours. If one pound of CO2 makes 8.7 cu. ft. of CO2, you will need 0.08 lbs. Because every pound of sugar makes 1/2 lb. of CO2, you need 0.08 X 2 = 0.16 lbs. of sugar every four hours, or between a half pound and one pound of sugar per day.

If you used a half pound of sugar per day, you would need 21 lbs. of sugar in six weeks. If you consider that only 80 to 90% of the sugar will be completely converted in this length of time, therefore, you should actually use about 24 lbs. of sugar in six weeks

yes use bakers yeast for 1 week brew, use 2 x 5 litre bottles placed different places amongst your plants to double up, 1 week is maximum for the high co2 content that the mixture will give off. repeat it weekly. remember that this only works well with the lights off period, ready for light switch on in the morning, or intermitent fans of 15 min on and off fans, no good for constant fans.[/QUOTE]

reefamadness said:

ok just mix bottles up and put in room and let stay for a week? do you know about how much co2 this produces? can my oscillating fans stay on ? i found this on site what do you think about this?

1 pound of CO2 should theoretically yield 35 gallons of carbonated water at 100 percent saturation. Thats about 1 cubic foot of gas in 4 gal. An 8'x 8'x 8' room would need 2.64 gal every 4 hour to achieve 1300 ppm CO2. That works out to a little over 330 gallons in a 6 week period.


A pound of sugar will ferment into approximately half a pound of ethyl alcohol (C2H5OH) and half a pound of CO2. One pound of CO2 makes 8.7 cubic feet of CO2 gas at normal atmospheric conditions. In that 8 X 8' X 8' grow room, you will need to generate 512 cu. ft. X .0013 (1300 PPM CO2) = 0.66 cubic feet of CO2 every four hours. It takes time for the yeast to ferment sugar, so the size of container you should use in determined by dividing the cubic feet of growing area (512 Cu. ft.) by 32 = 16 gallons.

To determine how much sugar you need for six weeks of operation or until fermentation ceases, the following calculations are necessary: You need 0.66 cu. ft. of CO2 every four hours. If one pound of CO2 makes 8.7 cu. ft. of CO2, you will need 0.08 lbs. Because every pound of sugar makes 1/2 lb. of CO2, you need 0.08 X 2 = 0.16 lbs. of sugar every four hours, or between a half pound and one pound of sugar per day.

If you used a half pound of sugar per day, you would need 21 lbs. of sugar in six weeks. If you consider that only 80 to 90% of the sugar will be completely converted in this length of time, therefore, you should actually use about 24 lbs. of sugar in six weeks


yes use bakers yeast for 1 week brew, use 2 x 5 litre bottles placed different places amongst your plants to double up, 1 week is maximum for the high co2 content that the mixture will give off. repeat it weekly. remember that this only works well with the lights off period, ready for light switch on in the morning, or intermitent fans of 15 min on and off fans, no good for constant fans.

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[/QUOTE]

so basically what your saying is, you would need four bottles running at the same time every week which is,
for an 8 x 8 x 8 room then you will need 2 kilos ( 4 pounds ) of sugar and 6 teaspoons of yeast split in to 4 x 5 litre bottles so work out the price per week for your grow
in uk that would be about £3.00 GBP a week which is $4.90 USD a week but things like sugar and bakers yeast are cheaper in the u.s.
you can run as many oscillating fans and air conditioners as you want i suppose.
i have a 10 x 6 room and i run two bottles constantly.

Flo Grow said:

Your temps are actually fine at 82F.
If you plan on running CO2, then you'll need temps up to 90F for it to be effective and worthwhile.

Click to expand...

I thought 80F was the best temp for co2?

so basically what your saying is, you would need four bottles running at the same time every week which is,
for an 8 x 8 x 8 room then you will need 2 kilos ( 4 pounds ) of sugar and 6 teaspoons of yeast split in to 4 x 5 litre bottles so work out the price per week for your grow
in uk that would be about £3.00 GBP a week which is $4.90 USD a week but things like sugar and bakers yeast are cheaper in the u.s.
you can run as many oscillating fans and air conditioners as you want i suppose.
i have a 10 x 6 room and i run two bottles constantly.[/QUOTE] the last paragraph is on there by mistake. this is somethin i found posted on site and was askin you what you thought about it

i thought 75 was ideal temp

reefamadness said:

well thats something i found posted on site and was askin you what you thought . the last paragraph was from you on there by mistake [

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no i was talking about constant inlet and outlet fans,
set up 2 of your 2 co2 bottles lay them among your plants, and you can use as many oscillating fans as you wish, as they do not take the co2 away from the plants, if anything they mix cold/warm air co2/air and will thicken the stems on plants they are fanning on, exhaust fan will weaken your air/co2 mix.