Old lock handle fridges are surprisingly efficient. I have a 1949 Hotpoint and a 2022 LG. They both draw about the same amount of power when running, the difference is the Hotpoint runs less because it has four inches of insulation and a lock handle that seals much better than the drawer on the LG freezer. The only complaint with the Hotpoint is that it stays around 32.5°F which is too cold for veggies, but fantastic for beer.

And a lock handle that kills your kid in an hour or your money back.

Simply do not have children.

Issue closed.

They were efficient because they weren't self-defrosting.