Most people would agree that central air conditioning is necessary in the summer. Not only does it keep you cool, but it can also help to lower your energy bills. Before you rush out and buy one, it's essential to know how much they cost. The cost of setting up an AC unit varies depending on the size of the unit and the type of installation needed. Generally, a window unit will cost between $150 and $300 to install, while a split system or central air conditioning unit will cost between $1,500 and $3,000. Central AC units can range in price from a few hundred dollars to several thousand dollars, depending on the size of the unit and the features that are included. If you're looking for something basic, you can expect to spend around $500-$600. But if you want all the bells and whistles – such as programmable thermostats, humidity controls, and air purification systems – your unit could cost upwards of $4,000. However, the cost will be recouped over time through lower energy bills in most cases. An air conditioning unit can also help improve the comfort and livability of your home, making it a wise investment for homeowners.