Vortec PAC includes an integrated belt that holds tubing for delivering hot or cold air to the wearer along with a heat-resistant Nexus belt buckle. The adjustable-waist belt provides a quick connection to cool or warm air with the dual action air-conditioner switching quickly from hot to cold. The vests can be worn under other protective clothing and can be adjusted by the user, even with gloved hands. The diffuse air vests are available in three sizes to accommodate a range of body types. The plasticized PVC vest permits full range of motion with no airflow restrictions. The vest allows employers to eliminate the cost of heating or cooling large warehouse or shop areas.