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WOFATI, an acronym for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, represents an innovative approach to sustainable building, coined by permaculture expert Paul Wheaton. This building technique combines the affordability and simplicity of Mike Oehler’s earth-sheltered designs with Wheaton's focus on cost reduction and integration with the natural environment. WOFATI structures prioritize the use of readily available, natural materials, such as wood and earth, minimizing reliance on manufactured products and reducing the building's environmental footprint. Annualized Thermal Inertia, a key principle of WOFATI, utilizes the surrounding earth as a thermal mass, storing heat in the summer to warm the building during winter and retaining cool temperatures from winter to moderate summer heat, thereby minimizing energy consumption for heating and cooling. WOFATI designs typically feature large windows on the uphill side to maximize passive solar gain, further reducing energy needs. WOFATIs are intended to be situated on or near a woodland, embracing the concept of harmonious integration with nature. Notable examples of WOFATI structures, including Allerton Abbey and Wofati 0.8, can be found at Wheaton Labs in Montana.

Made of ancient diatom skeletons, diatomaceous earth is edible to mammals but deadly to insects. De scratches through a bug's waxy exoskeleton coating turning their innards to teeny tiny bug jerky.

Rocket mass heaters are better than wood stoves because they run cleaner and use less wood. Wood stoves lose a lot of heat out the chimney that the rocket mass heater stores in the mass. 75% efficient wood stoves are often run at 3% efficiency at night. Rocket mass heaters use the mass to keep things warm at night.

Hugelkultur, is an advanced permaculture technique for creating self-sustaining raised garden beds filled with decomposing wood. The technique involves burying a variety of wood materials, including logs, branches, twigs, and even whole trees, under layers of soil, creating a complex and dynamic environment for plant growth. As the wood decomposes, it acts as "a sponge to hold water," reducing the need for irrigation. This decomposition also generates heat, which can extend the growing season, particularly in cooler climates. The shrinking wood creates air pockets, making the beds "self-tilling" and promoting excellent aeration for plant roots. These "parking spaces for water and nutrients," as described by Paul Wheaton, enhance soil fertility, attract beneficial microorganisms, and release nutrients, reducing or eliminating the need for fertilizers. Hugelkultur beds are remarkably adaptable and can be built in various shapes and sizes, as exemplified by Sepp Holzer's large-scale project in Dayton, Montana, which features nearly a kilometer of hugelkultur beds.

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.