Refrigerators. Just imagine your life without a refrigerator. If you go to 1820 you will have no refrigerator. From https://www.iea.org/data-and-statistics/charts/worldwide-ave... , now the 80% of the homes in the world have a refrigerator.

[And 50% have a washing machine. Mine broke a few months and it was a big mess until we got a new one.]