When to Buy a Window Air Conditioner Let MyContractorMatch.com's online services help you find air conditioning professionals for you today. A window unit is an air conditioner that is installed into a window or exterior wall. They are generally used when cooling one room or a small space, since window air conditioners typically can't cool much more than that. A window unit is also a better investment for renters, since these units can usually be uninstalled and taken with you. No obligation; just post your project. It's fast, free & easy. |