Yes it was outside air coming into the car. You don't have your Ventilation set up to recirculate. It is letting outside air in and if the temp is on warm, it will be hot. Change to recirculate(button under the temp control) and it should stop.
Are you referring to the temperature or the air flow? The Cruze tends to warm the air by about 10 F on the way from the outside to the inside. If air flow this sounds like the blower controls and/or baffles weren't closed properly.