Portable Air Conditioner Review - Is A Portable Air Conditioner A Good Choice For You? One solution to heat in the summer is to purchase and install a window air-conditioner. However, for renters and some home owners, installing window air conditioners is out of the question and a portable unit is the only choice. The following portable air conditioner review will help you decide what's best for your situation. Some apartment buildings will not allow use of window air conditioning units. Some windows (crank windows, for example) are designed in such a way that you cannot install a window unit. These portable air conditioners are mounted on casters, so they do not need to be lifted into the window for use. You must, however, place the units close to a window because the exhaust hose from the portable air conditioner must vent to the outside. These units are heavy, averaging around 100 pounds and some do weigh more than that.