"Portable air conditioners are movable units that can be installed easily. They have exhaust hoses that can be vented out easily through a variety of window types. On the other hand, the installation of window air conditioner is quite difficult and they can be fitted only in standard sized windows. Similarly, the price of portable air conditioner is more than that of window air conditioners. In case of window air conditioner, more is the cooling capacity, higher is the price. Portable air conditioners occupy unnecessary floor space that can be a block while walking inside the house while window air conditioners are placed completely out of the living space. Portable ACs emits lesser noise when compared to window air conditioners. Similarly, while buying portable air conditioner understanding the energy efficiency can be quite difficult as they do not have any official Energy Ratings while in case of window AC, there is Energy Star Rating which will help one understand the energy efficiency of the unit. Last but not the least, before buying either the portable AC or the window AC, advice from an HVAC expert must be taken."