Placement of the vestibule

Placing the vestibule outside the heated house envelope logically should result in the greatest savings since this configuration has the least area of common wall between the cold vestibule and heated house volume (see Figure 9.3.7). However, compared to an interior vestibule, the difference is insignificant. The greatest benefit of the exterior versus interior vestibule could be seen for the cold climate (1.1 versus 0.9 kWh/m2a reduction of the house heating demand). In both the temperate and the mild climates, the energy savings of the vestibule, whether exterior or interior, were approximately 1 kWh/m2a.

The argument for the exterior vestibule is therefore primarily economic: space within the highly insulated envelope of the house costs much more than an inexpensive construction outside the heated envelope of the house.

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