Do You Need to Turn on AC in Winter?

[JulianLynn]

You don't need to turn on AC in winter because the AC button in cars is the cooling switch, which is only used when the air conditioner is set to cold air. When using warm air inside the car, there's no need to turn on the AC button. Principle of Warm Air: When the car's air conditioner is heating, the compressor does not participate in the work. The blower blows the heat from the engine's cooling circulating water in the car's radiator into the car for heating, without requiring additional power from the engine. However, when the car has just started and the engine cooling water hasn't heated up enough for the air conditioner, it's best not to turn on the warm air immediately to avoid increasing fuel consumption. Precautions: Turn on AC when it's prone to fogging because when the car's cooling switch is turned on, the compressor will also start, making the air inside the car drier and helping to clear water fog on the windows. However, compared to using warm air alone, this method will increase the car's fuel consumption.

[LeAdaline]

As a car enthusiast, I understand the practical value of using the AC in winter. The AC isn't just for cooling—it works with the heater to quickly dehumidify the air, preventing window fogging and ensuring clear visibility. After starting the car, pressing the AC button and setting the heater clears fog in seconds, significantly improving driving safety. Relying solely on the heater without the AC often leaves residual moisture, causing fog to reappear, especially on rainy or snowy days. Turning on the AC activates the compressor, slightly increasing fuel consumption, but this cost is negligible compared to potential accident repairs. I've made it a habit to check the defogging function before every trip, especially in damp and cold conditions. Some newer cars feature an auto mode that intelligently engages the AC for optimized efficiency, which is very convenient. In short, never compromise on driving safety—this practice is worth adopting.

[Presley]

In winter driving, I always turn on the AC defogging function to prevent window fogging, ensuring quick removal of water droplets for safe visibility, with easy operation and low fuel consumption.

[MacMaverick]

I monitor fuel consumption and only turn on the AC when necessary for short periods to defog, reducing energy usage while maintaining a balance between driving safety and cost.

[DelAshley]

Turning on the AC can effectively dehumidify, which I often use in combination with warm air to prevent fogging and enhance driving reliability. The setup is simple.