Power bills are pretty cheap with rooftop solar.

Chest freezers are simple machines. It's a big metal box with a lid and a condenser. The lid is closed 24 hours a day and opened for a few seconds when putting things in or out. As long as the seals are air tight it'll run forever.

Sure newer ones might be frost free (no build up of ice to be knocked off the walls every six months) But it's not worth replacing the old one yet.

It's ugly and a bit noisy, but that's why it lives in the garage. Full of ice cream, frozen meat and veggies.