In the 1940s, you could buy a refrigerator with a "butter conditioner" to keep butter at a spreadable 65°F. Basically a compartment in the wall with a thermost

In the 1940s, you could buy a refrigerator with a "butter conditioner" to keep butter at a spreadable 65°F. Basically a compartment in the wall with a thermostat and heater, warmer than the main fridge but colder than the room. Manufacturers killed the feature to reduce energy waste, instead of adding thicker insulation around the compartment.