hi try this forget the ac you can either have recycled air or fresh just keep it to fresh air that's heated up this should work for you. good luck
i have asthma and when driving in a car with the heat on i can barely breathe. any idea on how to cope with this? . for over 2-3 years now i've had trouble managing my asthma while driving in the car. i can't have the heat on w/o having trouble breathing. i use the heat with the a/c controller on which i think helps dehumidify the air(not 100% on that). the only thing i can really do is crack the window to let some heat out so i can breathe the colder air. this happens in the winter obviously when the heat is needed. the biggest problem is when other people ride with me. i can't have them getting cold.