I've been working on a new,larger room design.
And I've come up with this.A small shipping container is cheaper than a shed of the same size(8x8x20=$800-$1000),then you get to set it up.
The A/C unit in this video is a refrigeration unit for a walk-in frig.(overkill)
They make a slimline wall mounted A/C blower with remote condensor
It's made for additions.That would do the job for 1/3 the cost.
As for Co2 I don't suggest a burner in a small grow room.
If you want Co2 enrichment use a bottled/regulated system.
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Aging is GODs way of telling us there's no time to waste...

WAS MOSE'S REALLY SPEAKING TO A BURNING BUSH???
OR WAS IT ONLY SMOKING???