Why defrosting your fridge is important and 3 smart ways to do it

While appliances make kitchen life easy, they come with their own maintenance challenges for effective functioning. For instance, a refrigerator is one of the hardest-working appliances in the kitchen, running around the clock to keep food fresh. It often builds up a thick layer of frost inside the freezer, which can gradually affect the appliance's functioning. And that's why the user manual mentions the practice of defrosting. It is important to understand that it is not merely a cleaning chore, rather it helps define the appliance's health in the long run. While modern refrigerators are designed to be frost-free, those who use older models can relate to the practice of defrosting. Let us understand the science behind frosting and the safer ways to defrost the refrigerator at home.

According to science, frost forms when moisture from warm, humid air enters the freezer, often when the door is opened frequently or left open unattended. This is when the moisture freezes on cold surfaces and accumulates. It has been found that moisture entering through door openings contributes to frost formation, particularly in humid conditions. As frost becomes thicker, it occupies storage space and interferes with airflow and heat transfer. It is important because, a refrigerator or freezer has to remove heat from the storage compartment to maintain a low temperature. According to experts, engineering research has specifically examined how frost and defrost cycles affect household refrigeration performance and energy use. Also, while modern frost-free freezers automatically remove this ice, but if frost keeps building up unusually quickly, it may indicate an issue with the door seal or defrost system.

If we go by the study published in the International Journal of Refrigeration, many modern household refrigerating appliances have automatic defrost systems that keep the evaporator clear of frost and ice, obviating any user interaction to remove frost accumulation that occurs during normal use. This study used laboratory measurements for 110 appliances over a period of weeks and field measurements for 195 appliances over periods of up to one year to observe the energy characteristics of defrosting systems. The data provided useful information about the pattern of defrosting and a comparison between laboratory measurements and field measurements. It was also clear that automatic defrosting doesn't produce a dramatic reduction in electricity consumption and energy use depends on the appliance, ambient temperature, thermostat setting, door-opening habits and frost conditions.

According to research by Oak Ridge National Laboratory for the U.S. Department of Energy titled ‘Analysis of Frost Formation and Novel Defrost Techniques for Commercial Refrigeration Applications (CRADA Hillphoenix/Dover Food Retail),’ frost buildup on freezer coils can reduce cooling efficiency by 15 to 25 percent. In simple words, as frosting increases, your freezer has to work harder, your food takes longer to get cold, and your electricity bill might climb slightly.

This is one of the safest yet time-consuming ways to defrost the freezer. All you need to do is, unplug the fridge and let the frosting melt down naturally. In this method, it is important to remove all the food and store it in a cooler with ice packs. Take out shelves and bins if you can and line the bottom with towels to catch water. Once the frosting loosens up, open the door and carefully scrape off the loose ice with a plastic tool, not metal. Once done, wipe it thoroughly and allow it to dry completely before restarting the appliance.

In this method, all you need to do is, place a heat-resistant bowl or container of warm water inside the switched-off freezer and close the door. The warm, humid air helps loosen and melt the frost. Replace the water when it cools and continue until the ice has softened. Make sure NOT to pour water directly into the appliance or allow water to reach electrical components. Also, assure that water is warm enough and not boiling. And before opting for this method, unplug the machine.

In this method, you have to position a fan outside the open, switched-off freezer so that room-temperature air circulates into the compartment. Increased airflow can help the frost melt faster while avoiding direct contact with heating equipment. Place towels beneath the appliance to catch water and periodically remove loosened pieces of ice.

Remember that defrosting temporarily interrupts refrigeration so food safety should be part of the plan. The USDA recommends keeping the refrigerator at 40°F (4.4°C) or below and the freezer at 0°F (-17.8°C) or below. An appliance thermometer is a useful way to verify these temperatures rather than relying solely on the refrigerator's display.