In texas when its 100 degrees outside, in may, with 94% humidity. It then turns into 135 degrees inside the car. When model a's were built they didnt have the traffic of today. If you live in the country and can keep a consistent pace while driving its not bad without a/c. But i the city stopping every 100 yards, dealing with traffic the inside of the car is downright miserable. Ive had my car with 3 layers on insulation, and a heat shield and you cant help but get sopping wet with sweat. So yes i installed one of kens a/c units 3 years ago. And even on the hottest of days (112 degrees) ive still never broken a sweat inside the car.