Looks like a heating element to me. It’s all disconnected but it’s something we don’t run into everyday.
My first instinct is an old-school heat dissipator for a solar heating system. Does the house have solar?
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No and it has a slate roof.
Either to melt ice or Electrocute Rodents? 
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These are the only two around the entire home so we don’t see these any where else?
Welcome back to our forum, Brian!..Enjoy and participate! 
What’s below it?
There’s a window well. This equipment does not exist at any other window well.
Interesting. I do not know what it is. However, my wild guess would be a heating element, possibly for plantings they wanted protected from frost.
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Well, let’s look at it, there is a window well with a window well cover with some sort of electrical device under the above window, is it to melt ice? or is it to deter rodents? What else could it be?
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That’s what I thought. In any case it’s disconnected and no where do we see this tech used anymore. Remove it and seal the opening! Thanks guys! Just when you think you saw everything…BOOOM! 
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If it’s disconnected and you’re curious, pull up the historic aerials of the property and see if there was ever a solar heating array on the grounds. They look like the old style heat dissipators, with the fins removed. They were useful in keeping a home’s thermal loop from getting too hot.