I've seen an even simpler non-moving device to reduce electricity use in supermarket freezers. Because the air in the freezer gains heat more quickly than the p

I've seen an even simpler non-moving device to reduce electricity use in supermarket freezers. Because the air in the freezer gains heat more quickly than the produce, the freezer switches on too often. A simple sleeve for the thermometer made in a material with heat capacity comparable to the produce makes the thermometer measure something closer to the temperature of the food. It got tested by the standards agency in the UK and is getting used in some supermarket chains (I'd post a link if I could find one!).