hydro is out of the question...i leave the grow for many days at a time often and soil is the only way that'll work. temps are not a prob as they're outside in a shed and it's still winter up here at the 4k' level and the room never gets above 80f...when the a/c kicks in or below 65f when the heater turns on. co2? never needed it due to low temps and open vents fulltime.

i didn't see your veg length...i veg for 8 weeks or until alternating branching is well underway and preflowers have shown. my total grow from seed to harvest indoors is appx 16 weeks...8-10 weeks for clones.