Final answer:
Two-story houses, particularly the I-house, are prevalent in certain regions due to their energy-efficient design features.
Explanation:
Two-story houses have been a prevalent architectural choice, particularly in certain regions, like the Midwest and the Mid-Atlantic.
The I-house, a two-story cousin of the Hall and Parlor house, is a common folk house type in these areas.
Efficient architectural features such as thick walls, insulation, and double-paned windows contribute to energy-efficient house designs.
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