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Should the car air conditioning be set to internal or external circulation in winter?

2 Answers

JoyMarie

09/04/25 3:49am

In winter, it is recommended to use both internal and external circulation for the car air conditioning. First, set the air conditioning to internal circulation mode to quickly raise the temperature inside the car. Once the interior feels warm, switch to external circulation to promote air flow. The optimal temperature setting for the heater is 23 degrees Celsius. Additionally, adjust the air vent direction to avoid blowing directly at the face, as this can cause fatigue and affect driving safety. Instead, direct the airflow towards the legs and feet; warming these areas will help warm the entire body. The AC button controls the air conditioning compressor. Pressing this button activates the compressor, which increases fuel consumption. The compressor's primary function is to provide cooling. It's important to note that the car's cooling and heating systems are separate. The heating system utilizes the vehicle's own heat cycle and does not require the compressor to operate.

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SanLondon

09/16/25 4:57am

I think using the air conditioning in winter requires a flexible approach. When you first get in the car and it's as cold as an ice cellar, turning on the recirculation mode heats up the cabin fastest and saves fuel. However, don't keep it on continuously - prolonged use makes the air stuffy as CO₂ levels rise, which can cause drowsiness and compromise driving safety. My routine is to switch to fresh air mode for a few minutes every twenty minutes after the cabin warms up. This maintains air freshness without significant temperature drops. Also remember: if windows fog up, immediately activate fresh air mode with AC dehumidification - it works instantly.

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