Refrigerators use more energy than any other appliance in a household. The US has over 200 million refrigerators running at this time. The temperature controller that I designed combined with a chest freezer will out perform any energy star refrigerator by a factor of 2 per cubic foot. Shrinking the size of the chest freezer will increase efficiency even further. In our case we switched from a upright energy star refrigerator to a small chest freezer and reduced our refrigerator energy usage by a factor of 8.
Please vote for our YATC temperature controller using the link below.