What is the standard temperature for car air conditioning vents?

[McRafael]

Car air conditioning vent temperature standard is around 4 to 10 degrees Celsius. The functions of air conditioning: 1. Achieve cooling effect through continuous refrigerant cycle changes; 2. Remove dust, odors, smoke and toxic gases from the car air to keep the interior fresh, and humidify the cabin air to increase relative humidity; 3. Use engine coolant, waste heat or heat generated by burner combustion as heating source through heater, then blow heated air (from inside or outside) into cabin via blower to raise vent temperature for heating purposes; 4. Draw in fresh outside air for ventilation, which also effectively prevents windshield fogging.

[McAdrian]

I've been driving for over a decade, and honestly there's no universal standard for air vent temperature. When cooling in summer, the air blowing from dashboard vents should be ice-cold to feel satisfying - typically about 15 to 20 degrees lower than ambient temperature. For example, on a 35°C day, vent temperature around 5 to 10°C feels most refreshing. This temperature depends not just on AC power, but largely on whether the car is moving. At highway speeds when refrigerant circulates faster, cooling happens rapidly, while AC performance drops significantly in traffic jams. My old car's vents never got cold enough until inspection revealed the condenser was clogged with leaves like a sieve. If vent temperature is noticeably high, it's likely due to refrigerant leaks or compressor issues - get it checked immediately, otherwise summer driving becomes like a sauna session.