The Good Aspects.
There are many good aspects of a window a/c unit. The first is that they are fairly low-cost as compared to a central unit. You can buy one and stick it in the window, another great aspect is that theyre really simple to hook up, and youre ready to go. If it breaks, you can simply buy another one considering that they are so inexpensive. They will cool down the room you set it in, and eventually it will cool the whole home. They dont use much energy as compared to central units, and they will decrease your energy expenses considerably.
The Bad Aspects.
The bad aspect about window air conditioning units is that theyre extremely loud. If you have ever heard a central air unit, you understand they can be really quiet. Compare that to a window a/c unit and its like night and day. Window air conditioning units also dont cool as much as central units do, and they take a long time to cool. The window a/c units also sit inside open windows so they sometimes allow warm air to escape around the edges. They can become congested from dust and pollen and other air impurities, and they also dry the air out severely http://www.planoair.com/ac-repair-heating-repair-mckinney-tx.html .
As you can see, the good and bad aspects are on an even keel. Just remember that any a/c unit is better than not having any at all, so get what you can afford, but recognize that having a window a/c unit is all about what you make it.