ventilation in multi room tent

Hello,

I am doing a small home grow using one of the multi room tents. My main room is 3x4. In the side room I have 1x3 with 2 sections. I'm going to use the smaller top room for clones and/or seed starts, and the lower room(with more headroom) for vegetative. I have plenty of light for each room. T5 for top room, and then 200 and 100 LED's, as well as a 400W HPS. The 100W is dimmable so I will probably use that for the vegetative and then use the 200 and 400 HPS for flowering.

Our climate is perfect for mid spring/summer grows. I will be using the tent mainly for winter and early spring. The tent sits in an insulated shed. I have a wall mount electric heater that I use to bring the temps up in the shed, and then the tent, with lights gets things where they need to be.

In the main room I have an exhaust fan and small circulating fans. I would like to keep it simple in the other 2 rooms. I don't think the rooms will get to hot, but if I open vents, it might be a little too cold. Could I get by with a circulating fan in the lower vegetative room?

Appreciate any thoughts.

Possibly another topic, but curious to see what folks thing of this.
Because I am using an insulated shed, I have somewhat of a closed circuit.
The ambient temp of the shed is in the mid 60's. I'm then able to get the temp in the tent in the 70's.
Right now, in early veg, and not using the vent fan, as I don't need it. If I open one of the flaps, it will bring the temp of the tent down to close to the temp of the shed, which would be a little cooler than I'd like.

When I get closer to flower, would it make sense to do one of those DIY CO2 buckets in the shed to bring CO2 levels up? I guess I am considering this because I have the shed itself pretty closed up, as in closed system. I would imagine that then opening small vent flaps at bottom of tent would pull CO2 in the room in and that way any exhaust from fan(which is into room for now) would just circulate any CO2 back into shed.

Bueller?

i hadn’t seen much on the multi room tents and thought it was an interesting situation.
Also for A small room that would have to be vented, so have some additional source for co2 seems like a good, low resource move.