What's going on with my portable ac chiller unit?

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Can anyone help me please.

I really don't like the hot weather and wake up continuously a night.

I have a portable ac unit with an exhaust pipe that I put out the window, but I have two questions.

Firstly, my room starts at 28 or 29 degrees, but however long I have the machine on for, even though it is clearly still pumping out chilled air, it won't drop below 24 degrees.

Secondly, you can feel the cooled air blowing out when you walk into the room, but as soon as the unit is turned off you can feel the temperature in the room rise a couple of degrees. Why is this?

Basically, it seems to have the potential to chill well but doesn't quite make it, also it is way too noisy to leave on overnight.

Thanks

I will guess that the power of the machine is not very high, and that warm air come in through the window.

Is this a machine that collects water in a drawer which you have to empty?

Do you know what its power is? there should be a Watts or kW or Amps rating on a plate round the back, probably near where the cable goes in.

In the same way that a 1kW heater can warm your bedroom, on a frosty night, from (say) 10 degrees to 18 degrees, the same amount of power is needed to chill it from 28 degrees to 20 degrees. In both cases, if the window or door are open, the machine is trying to heat (or cool) the world.

When you switch the machine off, the fan stops taking the heat outside, and the machinery inside (some of it will be quite hot) then releases its heat into the room, possibly also some of the water that has condensed on the chiller will steam off into the room. If the machine is capable of running the fan with the chiller turned off, it may be able to cool itself down before you switch it off. You may do better to push the machine out of the room when not in use.