• Marco Bonifaccino

Proper Auto AC Vent Temperature. What temperature should the AC blow?

Updated: Sep 30

How to check if the vehicle AC is cold enough? Do ambient air temperature and relative humidity affect what temperature should the air conditioning system blow?

In this video, the founder of AC diagnosis, Marco Bonifaccino, explains how the environmental conditions outside the car, ambient temperature and relative humidity, affect the performance of the car air conditioner. And how IoT (Internet of Things) technology can help the car mechanic and the car repair shop to perform a more accurate AC check taking into account all these parameters.


As a rule of thumb, when the ambient air temperatures 70° degrees Fahrenheit (21° Celsius) and humidity 20%, the AC outlet air temperature should be in the 35°-40° degrees Fahrenheit range. On the other extreme of 80° degrees Fahrenheit ambient air temperature and 90% humidity condition, the AC outlet air temperature might be in the 45° to 50° degrees Fahrenheit range.

That is a temperature differential of 30°-35° degrees Fahrenheit. Because of all these variations, it is difficult to pinpoint what the AC outlet air temperature should be on all applications.