Refrigerators quietly consume energy. Every time you open the door, cold air is forced out and warm air is brought in. Therefore, the compressor must run for a long time to cool the new incoming heat. Most of the energy consumed by the freezer is used in this cycle.
There is a well-known trick to break this cycle. That means filling the fridge. The finished freezer is like thermal mass. When the door is closed, the frozen product stabilizes the temperature and prevents hot air from entering.
But what do you do when your fridge is half empty? You don’t have to buy groceries just to save money on your energy bills. You can also use non-food items to take up space. This simple trick, often called “filling an empty fridge with water to improve energy efficiency,” can reduce your usage without costing you a cent.
Why does a ready-made freezer save electricity
It has to do with physics. Cold air is thick. Warm air is not. When the fridge is full, there are fewer gaps for hot air to enter. The frozen food inside acts as a buffer that cools the air entering through the seal or during the quick access.
An empty freezer is like a thermos flask without liquid. As soon as you open it, the interior heats up. A full fridge keeps things colder for longer. When your compressor runs less time, your energy bills also decrease.
Non-Food Items That Work
There is no need to store extra food. Use inexpensive, reusable or free products. The best options for filling an empty freezer and increasing energy efficiency are:
- Newspaper: Roll up old newspapers and insert them into the openings. Free and takes up space efficiently.
- Shipping Peanuts: Foam peanut bags for online orders? Use them. It can be shaped to fit irregular spaces and retain cool air well.
- Water-Filled Ziplock Bags: A bag of frozen water. They have two purposes: to add thermal mass and to provide emergency ice during power outages.
- Plastic containers: Reusable take-out containers filled with water and neatly stacked. It is durable and easy to move.
- Milk Jugs: A clean plastic milk jug filled with water is a classic DIY solution. It is rigid, reusable and endlessly recyclable.
A step-by-step guide to organizing
Don’t just throw things away randomly. Even a disorganized freezer can be inefficient if the thermostat doesn’t read the temperature correctly. Follow this process to properly fill an empty freezer to improve energy efficiency.
- Defrost and dry: Start over. If you have frost in your fridge, thaw it first. Remember to dry completely so that the ice cubes do not stick to the filling.
- Front-Load the Food: Move the actual food to the front and to the side. This way you get what you need quickly and minimize the time it takes to open the door.
- Fill the Center: Fill the center cavity with your chosen filler items. This is the area most sensitive to the effects of warm air currents. Pack it tight in newspaper, peanuts, or a container of water.
- Protect the Thermostat: It is important not to block the vents or the thermostat sensor. Leave a small air gap at the top and sides where the sensor will be placed. If the sensor cannot detect the actual temperature, the compressor runs unnecessarily.
Maintenance tips
This is not a “set it and forget it” mission. You need to maintain this setup.
Check the fillings at least twice a year. When using containers with water, be careful to avoid spills or evaporation. If you add or remove food, Replace or adjust them. If the container in your fridge leaks, disaster waiting to happen.
The type of freezer is also important. Chest freezers are generally more efficient than upright freezers because the cold air stays still when you open the lid. Vertical freezers lose more cold air when open, so filling the freezer is more important than filling an empty freezer with water for energy efficiency**.
There is no magic number for how much you need to fill. Make sure the main space is reserved and sensors are clear. This is a small change. But after a year, the power saving increases even more.
