I don’t know. In case of a hypothetic atomic minifreezer you basically end up with infinite term food. This might be a bit overpowered. Atomic minifreezer slightly less so.
Speaking of Minifreezer/Minifridge, I’ve had an idea for a direct upgrade of sorts.
Megafreezer and Megafridge. First of all, the Megafridge shouldn’t be easily found. Best case scenario, ONLY Deluxe RV should spawn with it. If not that, make it only craftable.
Megafreezer shouldn’t be anywhere to be found, period. Only craftable.
So what are the “stats” of those?
Simple. First of all, twice as much storage space as their mini variants. Their power usage should be higher, maybe 3 or so times higher, to account for less space needed for the same amount of storage. Crafting should take a considerable skill, not as simple as duct-taping two freezers/fridges to each other and calling it a day. So probably 2 more skill required to craft them than the mini variants, along with the recipe found in high end electronic book.
Or another idea. Mini-Refrigerator. It can either keep things cold, or freeze them. ( Obviously not both at once. ) Maybe a rare find is some vehicle, the bonus here is depending on your food stocks situation you can change what you need on the get-go, saving you valuable tile in your vehicle.
Or you know, we can combine both of my ideas and a Mega-Refrigerator is born.