Since I grew up and left home, my dad kept using an inefficient freezer from the 1950's, my own family went through 5 of the newfangled energy-saving freezers, prompting me to question the environmental friendliness of most modern appliances, and cars.
Remember to factor in the supply chain, and shipping costs.
If we keep burning the fossil fuels we are going to keep increasing the temperatures. If we switch the power plant the freezer is plugged into to
power the freezer and the powerplant the factory making freezers is plugged into, and replace the trucks moving the freezers around, we improve the odds of a nice world in fifty years, regardless of whether or not the freezer is low tech cheap junk or not.
Remember to factor in the supply chain, and shipping costs.