Boatycall
good points about options for energy savings going endless.
I know a guy in CA, who has 6 tons concrete heat accumulator buried in his backyard. Solar water panels (cheap) heat it up in the afternoon and he draws the heat for water and house warming at night.
All he pays is for very small energy the electric pump draw.
But those are pretty expensive and complicated ideas, while light bulb exchange was plug&play in my camper. I am trying to make it as easy in household freezer.
Than I would add some to your energy calculation. When you have poor light in the freezer, you keep the door open longer. The energy useage can multiply very fast.
