Ive grown 4 rounds of indoor product in the last 3 years and now with the addition of my baby boy to the family…“MY GROWROOM” is now his bed room.
My tents got moved outside but still indoors to my aluminum barn 12x12x25 (rough estimate)
No insulation yet
1 330$ ac unit
Lets hope this works…for now
Improvements coming after this cycle
I’ve got to say, your priorities are questionable, putting a kid before quality, cheap craft weed. 
If your climate isn’t too bad, you might do ok in the winter without insulation. I grow in a shed outside without insulation. Wood and drywall though, not sheet metal. Between the lights and a heater it does pretty well.
Adapt and overcome! If it works, send it! As long as your AC keeps up you should be fine. I ran before in a non insulated shed. Framed off a section and hung a window unit in the framed wall. Had to keep the door open to shed though so exhaust heat would expel.
Congratulations on the new addition.
The weed shed will work out one way or another
Somehow my plants keep surviving in 100+ degree weather(inside the tent)…fall autos are gonna be magnificent
Might end up going down a similar route
Hey growmie! I have a similar type grow but i made the room and insulated it. One thing i would say is shorten the distance of your exhaust on the acm, as the blow out tube gets hot. I wrapped my short blowout tube in insulation aswell to cut down on excess heat! 
( well i did have it wrapped! I must have forgot to re wrap it after i cleaned it 
)
Portable ac is setting off to the side, along with a tower fan and oil filled heater for winter time.
So after a few days of 99+degrees my plants seem to be doing better than surviving and maybe thriving. 2 days ago, I did a hard core defoliation of my two photoperiod plants and re topped one of them and the extreme heat hasnt killed em yet…
Has anybody else had successful crops in extremely high heat??
