The replenishment air will come from any area of the house with an air leak making that part of the house even hotter and more humid than if you didn t have the portable running at all.
Portable air conditioner vs window air conditioner.
Portable ac units hover around 70 db while window ac units tend to be near 50 db which is one eighth quieter.
This is generally more important when considering a portable air conditioner as the ac is inside the room.
For the most part when it comes to portable ac vs window ac the window units win.
Portable air conditioners are usually around 100 more expensive than window air conditioners of the same cooling capacity.
The fact that a window air conditioner uses a compressor that is situated outside the room should in theory make them quieter.
Also because portable air conditioners are generally larger and start at a higher btu h they will be more expensive than window units with a lower btu h.