Abstract: A chilling system for reducing the temperature of water used in an evaporative air conditioning unit (EAC) to increase its efficiency and efficacy. The chilling system is integrated within a frame for convenient and secure retrofit to the EAC. Water is pumped into the chilling system via a water supply line from the EAC. When the temperature of the water in the water supply line is above a preset high temperature, the power supply turns on the thermoelectric chilling device to remove heat from coolant, which coolant passes through the heat exchanger to remove heat from the water passing through the heat exchanger. The water, now cooled, is discharged back into the reservoir of the EAC. This cycle continues until the temperature sensor indicates that the temperature of the water has fallen below a preset low temperature, at which point the power supply turns off the thermoelectric chilling device.