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WOFATI structures are characterized by a thoughtful design that prioritizes passive systems and natural, locally sourced materials. The "two-skin" system, composed of a double layer of polyethylene membrane, encapsulates the earthen roof, providing a durable and waterproof barrier. The lower layer hugs the structure, while the upper layer defines the thermal mass surrounding it, with at least eight inches of dirt between the layers and sixteen inches on top. WOFATI designs emphasize a harmonious integration with the surrounding woodland, incorporating the "soil on wood" building technique. This method eliminates the need for a conventional concrete foundation, making construction faster and more affordable. A distinctive feature of WOFATI houses is the large gable roof on the downhill side, often incorporating glazing to allow light penetration, while at least 35% of the uphill wall features windows for optimal passive solar gain. This strategic placement and sizing of windows is crucial for maximizing natural light and regulating internal temperature, contributing to the effectiveness of Annualized Thermal Inertia.

The lorena cooktop, a specialized component of rocket stoves, is designed for optimal heat transfer and cooking efficiency. It features a metal plate with a strategically placed central hole situated directly above the rocket stove's burn chamber. This central hole allows for the placement of large pots, facilitating rapid heating through direct contact with the intense flames generated by the rocket stove. The metal plate surrounding the central hole serves as an additional cooking surface, providing versatility for a wider range of cooking needs. This dual-purpose design is meant to maximize heat utilization from the rocket stove, contributing to both energy efficiency and reduced cooking times. Discussions about the lorena often involve integrating it into an outdoor kitchen setup, further enhancing its practicality. The lorena embodies the continuous innovation within rocket stove technology, aimed at improving heat transfer and enhancing cooking performance.

WOFATI structures demonstrate remarkable effectiveness due to their unique design features and emphasis on passive systems. The "two-skin" system, characterized by a double layer of membrane, protects the structure from moisture, ensuring dryness and longevity. WOFATI designs prioritize the use of natural and locally sourced materials, primarily wood and earth, significantly reducing the building's environmental impact and embodying the "freaky-cheap" philosophy pioneered by Mike Oehler. The core principle of "Annualized Thermal Inertia" harnesses the earth's thermal mass to regulate temperature fluctuations, providing passive heating in the winter and cooling in the summer. Large windows strategically placed on the uphill side, along with a spacious gable roof on the downhill side, often incorporating glazing, maximize passive solar gain, further enhancing energy efficiency. By minimizing reliance on artificial heating and cooling systems, WOFATIs achieve substantial energy savings. Allerton Abbey, the first WOFATI built at Wheaton Labs, exemplifies the practicality and success of this building technique