Head cooling apparatus

A head cooling apparatus, comprising:

• a hollow semicircular case removably fitted within a crown of an existing hat, without structural modification to the hat, the case further comprising:
• a rim shelf proximal to a circumference of the case;
• a plurality of vents within the rim shelf, each vent approximately ninety degrees apart, the vents comprising a first vent, a second vent, a third vent, and an intake;
• at least one hook and loop on an exterior of the case;
• an access panel within an exterior of the case;
• a squirrel cage fan within the access panel, the fan adjacent to the intake;
• a sealed non-evaporative cooling cartridge removably disposed within the case;
• a battery removably disposed within the case;
• a first connection in communication with the battery;
• a switch in communication with the first connection via a second connection, the switch in communication with the fan and the battery;
• a breathable panel removably fitted to the rim shelf;
• a plurality of cutouts within the panel comprising a first cutout, a second cutout, a third cutout, and a fourth cutout, the first cutout in alignment with the first vent, the second cutout in alignment with the second vent, the third cutout in alignment with the third vent, and the fourth cutout in alignment with the intake, the fan drawing air into the intake, the fan forcing air across the cooling cartridge and out the vents.