Having an Air Conditioner System will definitely increase the chances of selling a home quicker. Especially when home buyers are comparing with other homes that do not have a cooling unit.If your home has ductwork, efficient windows and insulation already, the cost of putting in an Air Conditioner may increase the value of the home to make it worth the investment.  Typically according to “The Nest” homes increase in value on average of 12% when the home is in a climate where it will be appreciated.However even if you do not recoup the entire value of the air conditioner when you sell, the amount of personal use you get out of the unit  to live in comfort in your home should be a factor when deciding to upgrade your unit.