Had a ideer for a A/C system

Honestly I think part of why this works is it pulls moisture out of the air because of the condensation on the heater core. Also simply exchange warm air with cool air will make a difference and while I agree that 30 degrees sounds like a crock I am sure it would be noticeable. As a side note most people do not spend an hour or more in there car so even if the ice would last for 30 to 45 minutes just to cool the air at least some it would help.

I have not personally tried this I only saw the build and thought it was intriguing.