i bought a portable air conditioner last yr to try and sort my hot bedroom.
It was so noisy i had to give up on it( you certainly couldn't sleep with it on. Also, they weigh a ton and are big and bulky so not easy to store for the 350 days of the year when you wouldnt need it. You aloso need to vent it out of a window (A bit like a tumble drier)
The other thing was the minute you switch it off, the room almost immediately heats back up.
Sorry to put you off, but i bought an elactric floor fan in the end. It was alot cheaper, and works much better.
Good luck