Question about Climatech YFA-05C

Test: Bedroom under the roof. Today 24.1 degrees. Device not set up by the window, but one part in the corridor and the second in the bedroom. After 20 minutes 23.1 degrees. But felt much cooler. Maybe 20 degrees by the time I go to bed. Then everything is switched off.
Of course, it would be better if the main unit was outside by the window. But that doesn't work structurally. The vents are very short. It will work in a caravan/mobile home. But it doesn't matter. The bedroom is cooled. The warm air in the corridor is removed via a draught. This device (split) is much more efficient than the previous device with a hose to the outside with 2-3 times less power.

According to the data sheet, the air conditioning system delivers 5,000 BTU/h - although technical specifications for Far Eastern appliances are as relative these days as all truths in the postmodern age. By way of comparison, the air conditioning in a car typically has 6,000 to 10,000 BTU/h. If you can imagine that a very small car air conditioning system can keep your room or caravan reasonably cool when running continuously, this appliance could do it. However, the cooling down process will take time.

I don't understand the question.