Someone once told me that window air conditioner units are better and more energy saving if you have an outdated home.
Running a central air conditioner plan in an outdated home can end up costing you more to use the thing, and also, it is possible that the home may not even have air duct, so that alone would cost a fortune! I never had really thought about this, because I have been using central air conditioner for decades now.
Because I live in the south, having window air conditioners are not really an option. Everyone has central heating and air conditioner. If you were to try to have a window air conditioner plan in the south, you have a lot of potential problems to deal with! Not to mention, there are no windows in the way these homes are built that would accept a window air conditioner! However, if you have an older home and live in the south, you can get yourself a portable air conditioner unit, or maybe even a swamp cooler mixed with a portable air conditioner unit. However, back to the point on hand, I did find out that having a window air conditioner component does save tons on energy use in an older home, instead of a central air conditioner, and so, if you have an outdated home, go with the window air conditioner component if you do not live in the south area of the United States of america! That is what I did for our older home that I have as a Summer getaway in the north.