Aluminum ingots are used in the production of household appliances as they can be easily molded into various shapes and sizes. They are commonly used to make the outer casings and frames of appliances such as refrigerators, ovens, and washing machines due to their lightweight, durable, and corrosion-resistant properties. Additionally, aluminum ingots are also used in the production of heat sinks and electrical components within appliances to dissipate heat efficiently and ensure optimal performance.