Abstract: The invention includes systems and methods for using brackish ground water for air conditioning. In an embodiment, the present invention includes a method of using brackish water to provide cooling in an energy efficient and environmentally friendly manner. By way of example, the invention includes a method for providing cooling with brackish water including drawing brackish water from a supply well, transferring heat to the brackish water, and then returning the brackish water to the ground through a return well to a depth where the ground is already at a temperature similar to that of the now-heat brackish water that is being returned. In an embodiment, the present invention includes a cooling system that uses brackish water. By way of example, the invention includes a cooling system having a brackish water loop, a condenser water loop in thermal communication with the brackish water loop, and a chilled water loop in thermal communication with the condenser water loop.