Replacing ventilation system with Co2 system?

How much is it going to cost to run a room on Co2?

It sure depends on the size of the room, but let's take an example of 35 cubic meters?

.. and can you recommend a good Co2 release system for me? (Europe)

Fuzzy logic ppm2a by cap is a good controller. Buy it new on eBay. Tanks are like 100 ish a piece. Your going to want at least 2. And you can get a regulator pretty cheap. Your lookin around 5-600 bucks total. Don't cheap out on the controller , everything else buy cheap. Seal your room so there's no fresh air coming in and no air going out. Once you grow with co2 you will never go back. Your yield should go up about 30'percent

Titan controls have cheap and nice CO2 controls and environment controls check them out they also make the regulator as well.

NO, NO, NO!!!!! Carbon dioxide is fatal if you try to fill a room with it. I used a CO2 chamber to euthanize rats and mice at a research hospital, UCLA. I got stuck in a freight elevator at UCLA while carrying a large bowl of dry ice. Dry ice "melts" at room temp to form carbon dioxide gas. The gas is heavier than air. It was a good thing I knew to place the dry ice on the floor while waiting for help. That way the gas would have to fill the elevator from the floor up, so I had 6' 2'' to work with.

I use a homemade CO2 generator with a gallon jug, a half cup of yeast, 2 cups of sugar and hot water. I hang the jug right below the ceiling. As the gas is generated it will cascade from the jug down onto the plants. A ceiling fan circulates the gas and a floor fan was set in the door and adjusted so that the fan sucked the room air to vent out the door.

Good luck, BigSteve.

I found this and they swear it's the best on the market - http://www.hydroponics.eu/fans-and-filters-c-29/co2-release-system-s-20/evolution-digital-co2-kit-controller-regulator-analyzer-4965.html

It's costs 1100 dollars (Controller+regulator+analyser).

I will also going to need an AC unit, right?

What about a dehumidifier?

Helmut79 said:

I will also going to need an AC unit, right?

What about a dehumidifier?

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With Co2 injection you'll need to seal your room and control the environment with AC and dehumidification.

The most common way is to
1: air cool your lights with outside grow room air as an intake through your lighting run and then exhaust out of the grow room. This stops any grow room air passing through your lighting rig.

2: control temps by using an AC that's regulated.

3: control of RH through dehumidification.

4; control smell by running a stand alone filter and fan within the room.

If you exhaust a grow room with Co2 then ultimately you end up exhausting the Co2 out too.


J

I used to run sealed back in Missouri for maximum odor control.

You will need to manage humidity more than heat provided you grow significant biomass.

How would I know how powerful AC unit and dehumidifier am I going to need?

It would suck to buy one and then later realize it's not effective enough.

I have no experience with AC units, but I know that powerful dehumidifiers can cost thousands of dollars.

In the other hand, at some point it would be "overkill".

How do you make sure and calculate what capacity do you need for an AC unit and a dehumidifier?

Well, I had 28 plants in a room of 1400 cubic feet.

28 pots x 6 gallons = 168 gallons of coco coir.

I had ventilation, but let's say I didn't. How high would RH go in a sealed room?

99%?

Eventually it will probably max out, but how do I know at which rate does hydrated coir evaporate?

How do I know how fast does it increase RH in the room?

Ultimate question - how do I know how big of a dehumidifier do I need?

RH would climb as plants respire and grow.

Eventually it would most likely max out.

As for your other queries it would hard for me to guesstimate.

I use a 10L extraction per day dehumidifier in my 7x3.2x8 room with generally 4 plants and it can keep me at 45% without too much trouble. Removing as much as 3L of water per day when required to.


As for AC I live in the UK so it isn't required on my scale.



J

Typical for a sealed room, your dehumidifier will need to pull 4-5 gallons a day per 1000 watt hid. That is with big plants, full canopy.

If you have natural gas plumbed into your building or access to liquid propane, you might prefer a co2 generator over the co2 tank. Pound for pound, you get more co2 from propane since you're not toting that heavy ass cylinder.

Imo, refilling propane cans is fast, easy, draws no attention, can be exchanged at convenience stores.

I personally hate dealing with large, heavy, high pressure co2 cylinders.

You live in the UK, so are these same thoughts applicable?

SnapsProvolone said:

Typical for a sealed room, your dehumidifier will need to pull 4-5 gallons a day per 1000 watt hid. That is with big plants, full canopy.

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So if I would have ran my room on Co2 instead of ventilation (I had 7600W), then I should have had a dehumidifier with a capacity of 38 gallons a day (7,6 x 5).

38 gallons = 144 liters (wow, that's a lot).

I found a dehumidifier locally that costs 2438 euros (3273 dollars).

You're saying I wouldn't go wrong with this calculation?

SnapsProvolone said:

If you have natural gas plumbed into your building or access to liquid propane, you might prefer a co2 generator over the co2 tank.

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Yes, I have access to liquid propane.

I have been recommended to get my hands on "Fuzzy Logic ppm2a" controller, but can I still use the same controller when going for the Co2 generator route?

I'd say a dehumidifier is the biggest investment compared to other ingredients.

AC unit should be cheap compared to it.

im willing to say 2 50 pint dehumidifers will work just fine. about 220 bucks each. empty them twice a day or plum then out side or to a waste bucket or barel.

Choosing a dehumidifier is the biggest question.

Helmut79 said:

Choosing a dehumidifier is the biggest question.

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not really, its super easy. keeping up with the massive growth and huge yields is the biggest thing. if u buy a 3200 dollar dehue for what u stated in wattage, your paying way too much. just my advice friend. wish u the best of luck. co2 is like a whole different world. its amazing.