Over the past decade or so our diet has changed slightly. We almost never eat meat at home and have gradually eliminated most dairy products. Consequently, the volume of food in our refrigerator has decreased over time, and since we bought it in 2002 it is already considered obsolete, inefficient even. Refrigeration technology has improved markedly in the past 10 years to the point that devices made now use as little as one-fourth the amount of energy used by an equivalent sized refrigerator made in the '80s or '90s. And since we are contemplating moving sometime in the future we decided it might be a good idea to buy a new, smaller model when we do in order to take advantage of this greater efficiency.
So we went to our local discount electronics store and looked at all the models. Of course, smaller refrigerators cost less than larger ones, but when we looked at the energy consumption specifications we became confused. The bigger the volume of the refrigerator, the less energy it used. In some comparisons the difference was startling. If you look on the inside of the main compartment door of a refrigerator there is a sticker with the pertinent specifications, one of which is the average amount of kilowatts the appliance uses in a given year when operating continuously. We saw one 500-liter model that used only 40 percent of the energy that a 350-liter model used. The manufacturers make the comparison even easier by printing the average amount of money you will pay in electricity for a year on the outside of a given model. Moreover, there are star ratings, from one to five, that indicate energy efficiency in relative terms, with five stars indicating the most efficient.
We asked a salesman if there was a smaller refrigerator that was as efficient as a large one and he quickly said there wasn't. The difference he said was that larger refrigerators used inverters to control the operation of the compressors in a smoother fashion, while smaller refrigerators used conventional compressors that simply went on and off to control interior temperatures. The inverter, however, also makes the refrigerator itself more expensive. When we said our present refrigerator was 415 liters and that we wanted something smaller, he said rather presumptuously, "I can tell you which size you need."