My situation is a bit different, I have a little guest cottage, like 400 sq ft total, old & not insulated. The tent is in the bathroom there but seriously overheated the whole studio which is my man cave refuge as well. I spend a lot of time in it, I am sitting in it right now. I am cooling the entire cottage, not jsut the tent area with a 1200 BTU, once it is cooled off it is just loafing along, not using all that much electricity.
A game changer for me, I have been shutting down the tent during summer, the previous wall unit was super loud & could not cool it. I hated that thing.
Installation was not that complicated either just me & a buddy although we did need to run an electic sub panel, the electrical was ancient & no 220.
I am not needing a dehumidifier generally, the AC usually dries it out enough for my modest needs but I do run a small dehumidifier sometimes.