Regardless of whether you're in the market for an air conditioner window unit, a duct-free split system or central air conditioning, the three most important things to keep in mind are:
Window unit air conditioners ($150-$800) are fairly easy to install and some offer multiple cooling options.
Built-in window air conditioners ($300-$900) are installed into the wall. Built-in units generally consume more energy than window units but offer more features like heat/cool options.
Duct-free split systems ($300-$2,000) should be professionally installed but offer quiet, duct-free air conditioning throughout the home.
Central air conditioning ($400-$2,000) cools various rooms at once through your homes ducts, but some systems can be noisy.
Consumers should look for the following air conditioning features:
Remember, more BTUs is not always better. Higher BTUs means higher energy bills. For small rooms, air conditioners with extremely high BTUs can make a room chilly rather then comfortable.