Help with getting temps down.

Right with two fans in my 4x8 and a 6” inline fine for outtake, my temps are at 76degrees, during the day 80 with one 315cmh, when I try to plug in my 2nd light temps get up to 88. Was wondering if I could get a stand up a/c in there, only thing is, I can’t vent out my widow. Could I just get like 15ft ducting and run it into my bathroom?

You'd be dumping all that hot air into your bathroom...unless you're venting it out your bathroom exhaust. I would also warn against rising humidity...I tried a portable AC, for similar purposes (venting it out through the attic)...the problem became the AC unit actually raised the room humidity because they (portable units) don't quite operate like a wall unit or a hard unit (removing water from the air). Just my experience....good luck.

Or I might drill 6” hole on top of the door in the left...this stand up a/c also has built in dehu.

I had one in my 4 x 4 one summer but it took up too much space and wasn't worth it so I just grow plants outside in the summer and don't worry about the heat. But you probably have room in 4 x 8. I vented out through the attic. Mine has a built in 60 pint dehumidifier and is 10,000 btu. It did keep it cool in the tent though.

It’s 84 degrees in here rn with 2 315s on at the ceiling (6.6ft). Ideally want to have 3 lights running in flower. Could I run extra long ducting into that bathroom or the door on the left into the kitchen/living room/dining room, 3k sqft.

Currently with 2 315cmhs on.