How to Use the Heater in Winter Without Fogging Up the Windows?

[StDerek]

Methods to use the heater in winter without fogging up the windows include: 1. Open both windows to allow air convection and eliminate temperature differences; 2. Turn on the air conditioner with both cold and hot air; 3. Use defogging agents; 4. Wipe the glass with soapy water; 5. Dry the fog with a towel. The reasons for window fogging when using the heater in winter are: 1. Large temperature difference between the inside and outside of the car; 2. The window temperature is lower than the dew point temperature; 3. There is a temperature difference on both sides of the window. The heater utilizes the internal heat cycle of the car and does not require the air conditioning compressor to be activated. To use the heater, simply adjust the air conditioning button. When the car starts, the engine begins to warm up. Wait until the engine temperature gauge points to the middle position, then turn on the heater. At the same time, set the air circulation to external circulation to expel the cold air inside the car, and then switch the air circulation to internal circulation.

[RonanDella]

I always use a few tricks to prevent the heater from fogging up in winter. Don’t immediately blast high-temperature warm air as soon as you get in the car—it’s prone to fogging, which can dangerously obstruct your view. Instead, I first open the windows for about half a minute to balance the temperature difference, then start the engine with the key and switch to external circulation mode, using medium fan speed for a few minutes to draw out the moisture. Then, gradually increase the temperature to a comfortable level around 20°C, keeping the airflow moderate and directing it slightly downward toward the windshield. If fog does appear, don’t panic—just press the defrost button and let the high-speed air blow for a few moments to quickly clear it. Regularly clean the inside and outside of your windows and apply an anti-fog spray to reduce condensation—it works great. For cars with automatic climate control, it’s even easier: just press AUTO and set the temperature, and the system intelligently manages humidity and airflow, making it hassle-free and safer with fewer mistakes. Make it a habit to occasionally switch to internal circulation for short periods to retain heat, but don’t leave it on too long to prevent moisture buildup. Remember these tips, and you’ll drive safely with a clear view.

[StEmily]

As a homemaker, I worry about my kids getting cold in the car, but the fogging from the heater is terrifying. After getting in, I usually crack open a window slightly to let cold air flow in for a few seconds before closing it, then start the engine, turn on the external air circulation, and set the fan to medium for dehumidification. I gradually increase the temperature instead of blasting hot air immediately to prevent rapid fogging, keeping it around 21°C to ensure even warm airflow on the windshield. The defogger is my lifesaver—whenever slight fog appears, I turn it on high for a few seconds, and it clears right up. The rear window defroster also helps a lot. I avoid leaving wet items in the car to keep it dry and use dehumidifier packs to absorb moisture. The automatic AC is simple—just press AUTO, set the temperature, and the system automatically prevents humidity and fogging, allowing for worry-free driving.

[VonJake]

I found that preventing fog in winter isn't hard. Start by using the external circulation to dehumidify with low fan speed for five minutes, then warm up with the heater. Set the temperature to 23 degrees for stability to avoid fogging. The defogger button clears it instantly with strong airflow being most effective. Regularly clean windows and use anti-fog products for enhancement. New automatic systems are more convenient - AUTO setting automatically adjusts temperature, airflow, and humidity for safer driving.

[Alexis]

I'm very familiar with preventing fog when driving to work every day. After starting the car, immediately turn on the external circulation with low fan speed to dehumidify for a few minutes, then gradually increase the warm air temperature to 20 degrees. In case of emergency fogging, just press the defog button and turn up the fan for quick clearing. Avoid using internal circulation for too long to prevent moisture buildup, and keep the windows clean. With automatic air conditioning, simply set the temperature and it will manage everything for you, saving time and effort.