Ground-source temperature moderation (earth tubes, buried pipes, earth-sheltering)

Solutions

• Earth tube / ground-coupled air pre-conditioning: Buries intake ductwork to pre-temper incoming air using stable ground temperature.
• Earth-sheltered / semi-buried form: Ground contact stabilises indoor temperature year-round; easier and cheaper on a sloped site, it also serves wind/storm resistance.
• Ground-coupled hydronic cooling loop (buried pipe + radiator): A closed water loop buried roughly 1.5m deep (where ground temperature stabilizes near 12-15C) circulates through a salvaged car radiator and fan indoors via a