would an electric blanket under the hood help?

i do not see many vehicles here, but up north
and in Alaska, often you see wires and plugs
protruding from under the hood...for heaters.
I remember back in Nebraska we had a dip stick
warmer device that would lower into the " " slot.

here in california, we have fire
engines wired for heaters for those times when
we need to have a quick start with no time for
warming up the engine on a fire or rescue call.