Yes, a refrigerator loses its coldness faster when its door is open. When the refrigerator door is open, warm air from the surrounding environment enters the fridge, causing the internal temperature to rise. The refrigerator then needs to work harder to cool down this warmer air, which leads to increased energy consumption and a quicker loss of coldness.
Refrigerators are designed with insulation to help keep the cold air inside when the door is closed. However, when the door is open, the insulation can only do so much, and the cold air escapes while warm air enters. The longer the door remains open, the more cold air is lost, and the harder the refrigerator has to work to restore the desired internal temperature.
To maintain energy efficiency and ensure food safety, it's essential to minimize the amount of time the refrigerator door is kept open. Make sure to close the door promptly after use and avoid leaving it open for extended periods unnecessarily. Additionally, keeping the refrigerator well-organized and not overloading it can help maintain its cooling efficiency.