Also, is it safe to use the feature for long time? If the air inside the car is always recirculated, won’t it be saturated with carbon dioxide as we breath?
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>won’t it be saturated with carbon dioxide as we breath
If a car was sealed THAT airtight, then it would be impossible to run the AC on anything *but* recirculation mode, since adding outside air to a sealed vessel would pressurize it.
Since you can run AC without pressurizing your car, we can conclude that car cabins aren’t sealed anywhere close to airtight, and therefore CO2 accumulation isn’t a concern since there’s always some air exchanging with outside.
Sunhating’s answer covers how it works cooling-wise. By taking the air from the car and cooling that, the air coming from the vents is colder than intaking hot air from outside.
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