These units work by drawing air from your window, cooling it, and circulating it in your home. Window air conditioners can be installed anywhere and then kept there. Many of us are interested in buying a portable air conditioning unit, but are unsure whether or not to do so. By doing so, you can make an educated choice regarding what is right for both your home and wallet. Installing and using tower ACs is easier than installing split systems or window ACs. It is easy to install and does require ductwork. Portable AC systems require venting just like other types. For heatertips.com, I research and debunk myths about heating and air conditioning, and explain what works. As we have discussed, portable air conditioners only cool small rooms. Most models have exhaust hoses that you can place near a window for air to escape. Portable air conditioners are a great investment for anyone looking to stay cool and comfortable in the summer. Mary H. These smart air conditioning units don't work in a centralised manner, so multiple units are required. They use room air to cool down the space inside.