Question about Midea Silent Cool 26 Pro WF

Unfortunately, I can't say anything about it yet as we haven't put the device into operation yet.

It depends on the size and type of window. In my case, the appliance is located by a patio door and I have done well with the Furber product (Furber window seal 39 x 400 cm, 1 piece).
The exhaust air hose of the appliance ends with a smooth hard plastic ring with a diameter of 15 cm. It is advisable to form a thin end edge here using adhesive tape so that the hose placed on the zip cannot simply slip off. With a little tinkering, however, it will certainly work. And the tightness of the window seal is good and the material is so thin that the window can still be closed reasonably well even with the seal fitted.