I have a 5x5 tent, running CO2, mars hydro fc-e6500, just started flower, temps are getting up to 80-81. I know Ill need to figure out a way too cool it down, and im wondering if running an exhaust fan triggered at 78 or whatever would be better than using an AC unit. One way I'm sucking the hot air/ CO2 out and the other way I'd be just adding cold air and diluting the CO2. I have a co2 controller so I'm not worried about the levels, I'll pay a little more in CO2 costs to be able to control temps better.
Sealed Room w/ CO2, high temps
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Billy the Mountain
Well-Known Member
Your 80-81f temps are fine for LED lights, certainly no need to lower it.
Actually, with CO2 supplementation, your temps could be higher.
85f is fine w/ extra CO2
OldMedUser
Well-Known Member
You're good. I only add CO2 during the stretch to make the most out of that growth spurt and let my room run up to 90. Still is over 80 the rest of the time.
HydroDawg421
Well-Known Member
NOTHING beats a good AC unit in your grow! The inside AC unit won't dilute your CO2. I have a sealed grow (15x15x9) with the AC unit running, I've never noticed any dilution of CO2.
OldMedUser
Well-Known Member
I've been thinking about sealing up my grow room to use CO2 and what I'd really want is a portable AC unit with the dual hoses to outside. The single hose ones suck room air into it's exhaust stream to cool the motor where the dual hose ones pull outside air in to cool the unit so room air doesn't get used. Around $1000 tho and I'm not growing as much as I used to so that's on hold for now.
Your average hobby grower doesn't need to be all that fancy tho. With atmospheric CO2 around 420ppm now decent air exchange will grow great plants fast enough for most.
Boatguy
Well-Known Member
I have mine in the room with the gas water heater, and furnace.. Probably great amounts of co2 in there.Your average hobby grower doesn't need to be all that fancy tho. With atmospheric CO2 around 420ppm now decent air exchange will grow great plants fast enough for most.
You are correct though. Most people growing in tents are wasting their money trying to incorporate it into their grow.
Does have a cool cutting edge factor that draws alot of newbs in though
xox
Well-Known Member
co2 is a good time i pulled some serious weight with some hlg lights with co2 at 1500ppm. i think the biggest thing about co2 enriched rooms is actually building a properly sealed room from a carpenters perspective it was a pain in the ass to construct. your room should be fully insulated and have its own separate building envelope within the existing building insulated doors rubber gaskets on every door all the way around etc dampers on a spring etc. however a properly insulated and a properly sealed room with leds and a minisplit is wildly efficient. ive been working towards making my room as energy efficient as possible the only thing i still need to upgrade is the dehus for energy efficiency. the run i did last summer i costed it out it was about $100-$150 a month to run on avg. so a 4 month run would be $400-$600 to run and you would net approx 4-5 lbs.
OldMedUser
Well-Known Member
If your gas appliances are properly vented there shouldn't be any extra CO2 coming from them. If there is there is likely some extra CO with it and that can be deadly. You should have a carbon monoxide alarm in the area.
My grow room is down in an unventalated basement that's more of a tall crawlspace underground so I'm leery of having a tank of CO2 down there. If there was a leak the whole space could be filled with pure CO2 and become a death trap. For extra CO2 during the stretch I use a DIY alcohol lamp burning 99% methyl hydrate from the gas station. I have a simple CO2 controller that shows me it can get over 1500ppm in about 20 min so I set my exhaust fan not to come on until it hits 90F and as it's so cool down there the exhaust never comes on unless I use more than one 600W HID.
If you look close you can see the clean, blue flame at the top of the wick. Only uses 100 - 125ml in 12 hours. A 4000ml jug costs around $12Can.
Boatguy
Well-Known Member
You know carbon monoxide isnt co2 right?If your gas appliances are properly vented there shouldn't be any extra CO2 coming from them. If there is there is likely some extra CO with it and that can be deadly. You should have a carbon monoxide alarm in the area.
My grow room is down in an unventalated basement that's more of a tall crawlspace underground so I'm leery of having a tank of CO2 down there. If there was a leak the whole space could be filled with pure CO2 and become a death trap. For extra CO2 during the stretch I use a DIY alcohol lamp burning 99% methyl hydrate from the gas station. I have a simple CO2 controller that shows me it can get over 1500ppm in about 20 min so I set my exhaust fan not to come on until it hits 90F and as it's so cool down there the exhaust never comes on unless I use more than one 600W HID.
If you look close you can see the clean, blue flame at the top of the wick. Only uses 100 - 125ml in 12 hours. A 4000ml jug costs around $12Can.
View attachment 5254592
xox
Well-Known Member
if your natural gas co2 generator isnt burning properly ie not a blue flame because the removable tips need to be replaced it can potentially generate carbon monoxide in your sealed grow room. i have a monoxide detector/fire detector right in the centre of my room it is indeed possible.
edit: not to mention say your running 100 lb tanks to co2 instead of a burner and your regulator messes up or the tank leaks causing it to empty in the room it can displace all the oxygen which could cause asphyxiation causing death when you go inside
OldMedUser
Well-Known Member
I'm a retired chemist so yeah I do know the difference. CO is formed with incomplete combustion and there is some given off with every gas appliance. Very little with a well tuned flame but most are not that well tuned and dangerous amounts of CO can be produced. As long as the device is properly vented then no problem if there are high levels of CO.
A lot of people die every year from CO intrusion into their living spaces so it's no joke.
Boatguy
Well-Known Member
A lot of folks try co2 in a tent and only succeed in venting it into their living space via their exhaust. They try to up the ppms by limiting exhaust, and just have temp/humidity issues.
That is all i was trying to say
024matters
Active Member
That is correct. I saw it mentioned like that on (and other places). Although my logic tells me its buds surface temperature thats most important for terpenes evaporations. Many of them still evaporates under 80f but after 80 this process is amplified and more of them start to do it
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