Sited on a hilltop outside Pagosa Springs with 360-degree views of the San Juan mountains, this house balances a feeling of warmth and coziness with sweeping views of the continental divide. It uses an array of "passive" strategies for energy efficiency that include a long skinny building footprint running east to west, south-facing windows that maximize solar heat gain during colder months, and a robust layer of continuous insulation entirely outside the building's structure.