Abstract: Air-conditioned hardhats cool the wearer's head. A motor and fan are attached to the top of the interior of a hardhat to blow air over a coolant reservoir onto the wearer's head. The coolant reservoir can be filled with coolant. The bottom of the coolant reservoir comprises an atomizer, which allows the coolant to evaporatively cool the wearer's head. The motor is powered by a solar cell and/or a rechargeable battery. The rechargeable battery may be charged by a battery charger that is connected to the solar cell and can be optionally connected to an electrical outlet by a charging cord. A switch allows the user to control whether the motor is powered or not.