IF your portable has only one hose to the outside world, it might be doing you more harm than good. Those things are a cruel joke.
The one hose blows HOT air out but that air has to come FROM somewhere to replace it......and the replacement air is HOT air sucked in from the outside through small cracks all over the structure.
When it is really hot outside, the net difference in temperature that it gives you is not going to be much. Except for the time you are actually asleep in the bedroom where it is located, you might be better off without it.
Mine got moved to the garage and isn't run hardly at all, only when I need to be in the garage for a long period. And then I leave the door to the house cracked open so the replacement air is "pre-conditioned".
If you really need a portable A/C unit, get one with TWO hoses. They work like a "normal" window or central unit.