An Earth Air Tunnel (EAT) is a unique approach to building ventilation that uses the stable temperature of the earth to pre-condition incoming air before it enters a building. This technology can significantly reduce a building's energy consumption and environmental impact by reducing the need for traditional heating and cooling systems.

In an EAT system, a series of underground pipes are buried beneath the building, allowing outdoor air to be drawn through the earth and naturally cooled or warmed to a stable temperature before entering the building's ventilation system. This process also helps filter the air, removing pollutants and allergens, and can even provide humidity control.
earth air tunnel is passive heating and cooling technique using geo thermal energy.
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reference:
https://www.slideshare.net/vikasmahala/earth-air-tunnel-latest-ppt
https://geothermal-energy-journal.springeropen.com/track/pdf/10.1186/s40517-018-0097-0.pdf