I had the original york compressor style factory in dash a/c, and was never impressed with it, so i went to a fridgidaire lincoln style comp with all new components, it was cold but i still wasnt impressed with the airflow (bad ducting design i suppose), that is how i came across rainbow air, he says he has a unit that has heat , cold , defrost and it fits in the dash of the 77 supercab i am putting together, i had a regular cab so i know i will need more airflow