Co2 in split light cycle/rooms?

Hey RIU, I've been stumped on this thought I've had. I'm in the process of designing a new setup with 2 seperate flowering rooms. I'm going for perpetual but to keep heat down and electricity usage in check, I'll be running one room during the day, and the other at night.

Now my question is, if I'm using a co2 tank with a controller, how can I enrich both rooms, but only when the rooms light is on? Hopefully that question makes sense.
The problems are obvious
1. At night the plants don't use co2 (or very little) so it's a waste.
2. In a sealed room the humidity will rise so I'll need to exhaust periodically, resulting in even more so wasted co2.

So is there some way I can do this without buying a tank and controller for each room?

Circulate air between rooms, making it one air volume, enrich 24/7.

SnapsProvolone What size fan would you suggest for moving air from room to room?
Would you need 2 fans?
I am curious how to cool a warm 85F room with no a/c no co2,its next to a room with a/c + co2
both areas have exaust vents ,could you elaborate a bit on how you would suggest doing this im stuck:/

Room volumes?

A- 16x11 /B- 14x11(ac/co2)

Two centrifugal blowers and ridgid duct, each minimum of 900 cfm. Set intakes and exhausts up so they are on opposite sides of the room. The length of the duct with elbows on ends should stop light.

Yea that was my initial idea.
So basically I'm stuck with dealing with the cost of wasted co2.

What about this.....
All the grow rooms (2 flowering and 1 veg/mother) will be built within a relatively small room. About an office size (10' x 8' x 8') .
So would it be cheaper to just seal the office room itself and use a propane/co2 Burner to enrich the whole office. And just leave the grow tents unsealed with intake and exhaust to circulate the co2? Or would that be even more of a waste? I thought I read burners are more efficient and cheaper to refill.

Check out the Atlas 4, two room controller.
http://www.titancontrols.net/products/co2-devices.aspx

I love my sentinels. I think you get more co2 per pound hauled using LP opposed to CO2. Cylinder weight difference is a big factor. Plus propane is commonly available at lots of places.

I personally would never recommend a co2 tank setup in anything larger than a tent, say 4x8 ish. But I hate hauling bottles and presently use natural gas, but have done all the options I've mentioned.

rickymac21 said:

Hey RIU, I've been stumped on this thought I've had. I'm in the process of designing a new setup with 2 seperate flowering rooms. I'm going for perpetual but to keep heat down and electricity usage in check, I'll be running one room during the day, and the other at night.

Click to expand...

Run one room only at night then.

- Jiji

edit: to clarify, one big room (or both small rooms simultaneously at night)

SnapsProvolone said:

I love my sentinels. I think you get more co2 per pound hauled using LP opposed to CO2. Cylinder weight difference is a big factor. Plus propane is commonly available at lots of places.

I personally would never recommend a co2 tank setup in anything larger than a tent, say 4x8 ish. But I hate hauling bottles and presently use natural gas, but have done all the options I've mentioned.

Click to expand...

I agree with you Snaps, I'm running the HydroGen Pro water cooled Co2 generator, wanted to run it on nat. gas but I don't have enough pressure here so I've been on LP, have a 20 lb. bottle and it goes for about 2 months in a 15x22 room and not in a basement either. I never even gave the tanks a thought other than N.F.W. I'm going to run like that.

Cannis said:

Check out the Atlas 4, two room controller.
http://www.titancontrols.net/products/co2-devices.aspx

Click to expand...

Just what I was looking for. I appreciate the link! ! I would use a burner but I'm trying to avoid temperature fluctuations... plus, with a 50 lb tank in a 3.5' x 7' room, it should last a few months I'd imagine.

Actually I'm curious. Does the atlas 4 allow you to run 2 rooms with a single co2 tank? Or does it just have the ability to run 2 tanks for 2 rooms?

Hmm, would need a splitter or manifold and run your lines from there, I'm not sure though if the controller will work in that fashion. Were I you, I would call Titan and ask them so you would know for sure then and they could also tell you what you need to do it properly.

Two solenoid valves installed post regulator. Each solenoid valve has a room, sensor / controller.