If the room you re attempting to cool has an exterior wall that leads directly outdoors you can cut a hole in that wall just large enough to provide adequate venting for all the hot air you re sucking out of the interior space.
Portable air conditioner venting into attic.
This will not only prevent the room from cooling but will actually make it hotter.
Fit the window kit to the length of your window and secure the kit in place.
According to the twh principle you can vent a portable air conditioner into any well ventilated space apart from the space being conditioned.
Simply attach any hose connector adapters and insert the hose.
Hooking this up to your typical attic would be bad.
Venting your portable air conditioner is easy.
Note it must be a well ventilated attic in this case or you will have a buildup of heat which will lead to premature thermal breakthrough of your insulation.
That unit has an auto evaporation function which is marketing speak for dumping the moisture that condenses on the evaporator into the vented air stream.
If the ac unit is not vented outside or into another room the hot air will remain locked up inside the space.
The condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house.
Put it in an attic full of blown insulation and you re forcing.