Should You Turn on AC When Using Car Heater?
2 Answers
When using the car heater, you should not turn on the AC. The AC button activates the compressor, which is the machine that pressurizes the refrigerant (Freon). Introduction to AC: AC is the cooling button, which is the most energy-consuming and fuel-intensive function of the air conditioning system. The hot air from the car's heating system does not require "cooling" at all, as the car can utilize the heat generated by the engine to produce warm air. Precautions for Using the Heater: Avoid directing the heater airflow straight at your face. Prolonged exposure to direct heat can cause driver fatigue, compromising driving safety, and may also lead to drier skin. Slightly open the window to ensure air circulation. Although you can adjust between internal and external air circulation, it is recommended to crack open a window slightly when using the heater for extended periods to maintain oxygen levels inside the car and keep the driver alert.
As a seasoned driver with years of experience, I believe it's usually wisest not to turn on the AC when using the heater. The heating system utilizes waste heat from the engine to warm the cabin. If you activate the AC, the compressor will engage to compress refrigerant, needlessly increasing engine load and fuel consumption. Since you don't need cooling in winter, why waste fuel? However, there's an exception: during humid rainy days or after snowfall when windows fog up, turning on the AC quickly removes moisture and clears fog - safety first. I once forgot to do this on the highway and nearly had an accident. Normally, operation is simple - just set the temperature and turn on the fan; the air will automatically warm as the temperature rises. When fogging occurs, press the AUTO or AC button for a few seconds to dehumidify before turning it off - it's effortless, worry-free and safe.