- Frost-free freezers contain automatic heating elements to warm the refrigeration coils and prevent frost accumulation. A timer triggers the defrost cycle at regular intervals. A thermostat prevents the heat coils from overheating during the defrost cycle.
- Frost-free freezers use up to twice the energy of manual defrost freezers.
- Frost buildup reduces energy efficiency. Manual models require periodic defrosting, which can take up to 24 hours. Self-defrost models cost $100 to $150 more than manual defrost models. They also operate with less noise.
- The drain tube on frost-free models should be checked occasionally for clogs that might interfere with operation. Manual defrost freezers should be defrosted when frost buildup reaches 1/4 inch.
- In 1955, the first home chest freezer capable of freezing fresh food was sold in the United States. It was not, of course, a frost-free model.
Function
Energy Use
Considerations
Maintenance
The First Home Chest Freezer
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