Justugh is steering you right. I made the room mistake with multiple AC and all. Ill never recover the cost or going back to one room and getting a quality mini split with heat pump.
Going with smaller rooms your temps and humity will be a lot of work to control. Minisplit in a large room...
Looks just how it should for 2nd week budding. Nice color, you did good with nitrogen levels on that widow. What line are you using - or just premix and water?
PS, Better work on that lattice / trellis work early , those are going to be heavy!