Depending on which side you blower is mounted. The division of air wash across the back and over the top is not equal, 50/50, so one side gets a little more air then the other. As far as blowing cold air, well that's kind of hard to judge. People will tell me that the heat coming out of the register is cold, yet their house will stay 70*. When your body temp. is 98* and your feeling air that is 80*, it feels cool.