We have a portable AC that we put in a 9x10 tent that was then inside a 10x10 eze-up with the solid walls. This was for our kids when we stayed at the Fort last August. It is a 12000 BTU unit. When the DW and I would get the kids up in the morning, they would literally have the covers pulled up around their neck. It did a great job. This setup not only kept the direct sunlight off the tent but also kept the rain off the tent.
The rear of the tent had a mesh window where we vented the AC.
Yes..........their is a person under that blanket. The portable AC worked well.