A patient warming device includes a gasket coupled to an interior surface of a base film to define a target region that is attachable to a body surface of a patient. The base film extends from a perimeter of the gasket to provide a surgical drape. An evacuation port is in fluid communication with the target region. When attached to the patient, suction applied to the target region via the evacuation port vasodilates the body surface of the patient such that a heat source communicating with the target region increases a core temperature of the patient.