Paul Kitagaki Jr./ pkitagaki@sacbee.com

Alec Escala, left, and Cassidy Goldman, right, participate Wednesday in their Design and Implantation class at Cosumnes Oak High School. The school built a LEED-certified house on campus to demonstrate sustainable building techniques, including a hybrid solar and tankless water heater, solar tubes and a geothermal HVAC system.

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