When my great-grandfather needed to warm his farmhouse, he would cut down a tree, chop it into firewood, and carry a portion back to put in the fireplace. If he ever wondered about future generations automating that chore, he might have imagined a mechanical man performing a similar task, much like the Tin Woodsman from The Wizard of Oz. He could not have imagined that his grandchildren would warm and cool their homes with the turn of a dial, taking advantage of technology and infrastructure that are inevitable only in hindsight.
The Tin Woodsman is irrelevant tech.