Let’s try again.
If I owned a storage company - with electrical power (i.e.for lights) I would discourage customers from hooking up a freezer within the locker - specifically to avoid odors from rotting meat and the possibility of hiding other dead things. The rental agreement would include the prohibition of same.
No government regulations or inspections involved - just good business practice. Lockers are considered private rental property with respect to search warrants - so that issue is moot.
If someone has a house furniture to include a freezer (while in the process of relocating) - I might offer an area for that purpose. It would be a secure section - where employees could access the appliances in the case of power loss, odors or leakage.
I’m sure there are prohibitions against storing chemicals, firearms and other contraband with many storage facilities. Maybe even local and State ordinances already on the books.
My storage unit doesn't have a power receptacle, the lights are inaccessible to the renters. I couldn't plug a freezer in if I wanted.
And did you notice that the freezer where poor Kitty's remains were stored WAS NOT plugged in anyway.