2014 kia forte owner's manual (canadian) section 4-115: "Operating the air conditioning system in the recirculated air position provides maximum cooling, however, continual operation in this mode may cause the air inside the vehicle to become stale."
@ s197gt, they have a valid criticism. Recirculation mode should only be necessary briefly, on a very hot or hot and humid day after the car has been sitting for a while. Any modern car should be able to be comfortably cooled by normal A/C in a few minu
My girlfriend's Sonata has really strong A/C. It takes a minute for the variable rate compressor to go to 100% output if it's been sitting a while but once there the vent temp is in the 30's on max. I find use of the max recirculate setting on auto temp systems varies by make and programming. My Acura uses recirculate most of the time on hot sunny days and even for a while on hot nights. But I also notice it prefers to use the lowest possible fan setting and max a/c to maintain temperature. My friends GMC Acadia, is the opposite. It only chooses recirc on very hot days and will switch back to fresh air as the interior cools down. But it also blasts the fan on high speed most of the time on those hot days to maintain the set temperature.
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maximum cooling, however, continual operation in this mode may cause the air inside the vehicle to become stale."