- Published in issue 10/1998 on page 54
for older models
If your refrigerator is still one of the old types with an ‘automatic defrost’ system, this economizer can help you reduce your electricity billls. These old models are provided with a small heating element to prevent icing up, but in general this is at best inefficient and adds unnecessary kilowatt-hours. The circuit described in this article limits the number of defrost cycles in such a way that your electricity bills are reduced without an increase in ice formation.