Step 1: Prepare the Materials
Here are the materials you will need to start this project:

Cardboard boxes
Polystyrene foam sheets
Adhesive or tape
Cooler (preferably a thermoelectric cooler)
A small fan
Temperature control unit
Energy source (battery or adapter connected)
Step 2: Organize Cardboard Boxes
Use large cardboard boxes to create the primary body. Cut and arrange these boxes according to your needs to create the main body of your refrigerator.

Step 3: Add Insulation Using Polystyrene Foam
Line the inside of your refrigerator with polystyrene foam sheets to maintain the internal temperature. This will help you better retain the cooled air inside.

Step 4: Add a Cooler and Fan
Add a chiller to provide the cooling function. Using a thermoelectric cooler can improve energy efficiency when cooling the inside of your refrigerator. A small fan circulates the air inside, ensuring uniform cooling.

Step 5: Add Temperature Control
Add a temperature control unit to control the internal temperature of your refrigerator. This will help you set and maintain the desired temperature.

Step 6: Connect the Power Supply
Get your refrigerator running by connecting the power supply to the cooler, fan and temperature control unit. You can use batteries or an adapter.

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Conclusion Your Homemade Refrigerator is Ready!
After completing the steps, you can enjoy your own homemade refrigerator. Both a fun project and a practical appliance, this homemade fridge can be the perfect solution to keep you cool on hot summer days. However, don't forget to consider safety issues when building any electrical appliance and take the necessary precautions.