Abstract: A rooftop temperature control unit for a vehicle having a conditioned space includes a housing defining a plenum and including an air inlet. The plenum is configured to receive an inflow of outdoor air from outside of the vehicle through the air inlet. The outdoor air defines an outdoor air temperature. A heat exchanger assembly is coupled to the housing and in fluid communication with the plenum. The heat exchanger assembly is configured to receive a first portion of the outdoor air from the plenum, to cool the first portion to a temperature below the outdoor air temperature, and to discharge the cooled first portion into the conditioned space. A blower is configured to receive a second portion of the outdoor air from the plenum and to discharge the second portion into the conditioned space at a temperature equal to or greater than the outdoor air temperature.