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The furnace is the world's largest charcoal iron furnace and the last to be built in Kentucky. The structure was state of the art in its time. With core of the furnace consisted of twin stacks built of local sandstone using traditional dry laid stone masonry, and today is counted among the top dry masonry projects in the world.
For example, a conventional heat pump system used to heat a building in Montana's −57 °C (−70 °F) low temperature or cool a building in the highest temperature ever recorded in the US—57 °C (134 °F) in Death Valley, California, in 1913 would require a large amount of energy due to the extreme difference between inside and outside air ...
These furnaces were still big and bulky compared to modern furnaces, and had heavy-steel exteriors with bolt-on removable panels. Energy efficiency would range anywhere from just over 50% to upward of 65% AFUE. This style furnace still used large, masonry or brick chimneys for flues and was eventually designed to accommodate air-conditioning ...
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The Estill Steam Furnace, a blast furnace was established in about 1830. [2] A post office was established in the community in 1857, and named for the Estill Steam Furnace. This was shortened to Furnace in 1882. [3] The post office was discontinued in 1975. [4]
Standing 81 feet tall, the furnace is the largest charcoal furnace in the world, and one of the largest 25 dry-stone masonry structures in the world. [10] The iron industry declined after the Civil War when iron deposits and timber to fire the furnaces were depleted, and innovation made charcoal furnaces obsolete. [ 9 ]
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