Two homes are identical, except that the walls of one house consist of 200-mm lightweight concrete blocks,

Question:

Two homes are identical, except that the walls of one house consist of 200-mm lightweight concrete blocks, 20-mm air space, and 20-mm plasterboard, while the walls of the other house involve the standard R-2.4 m²·°C/W frame wall construction. Which house do you think is more energy efficient?

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