Deciding if central air is worth the cost depends on your needs and the local housing market. If you live in a mild climate without severe temperatures, window units, fans, or a breeze from an open window may be adequate. But if you live in a hotter climate, it can be worth the price to keep your home at a comfortable temperature and may even save lives during extreme heat waves. This upgrade may also help you sell your home faster, as buyers will pay more for a working AC, especially in a hot environment.