This two-bedroom, two-bath Brookhaven house, listed for $729,000, is shaped like a pyramid.

The structure is split in the center by the front door, has sharply angled vaulted ceilings and is set deep into a 1.24-acre wooded property. Earth-tone walls, tile floors and a stone fireplace in the living room provide a rustic aesthetic. Ten skylights fill the rooms with natural light.

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About half the circa-1976 home is underground, says listing agent Nancy Stein of Douglas Elliman Real Estate. The subterranean construction and the overall energy-efficient design allows the house to store seasonal thermal energy for later use, circulate air and use heat generated by the home’s fireplace to maintain comfortable temperatures while using minimal energy.

“[The architect] made it so it would be more of a geothermal home,” Stein says, who is co-listing with Christopher Stein. An embedded heating coil circulates water throughout the home’s slab, which creates a rising thermocurrent and distributes heat, says an architect’s report.

Where the rooms are situated in the approximately 2,460-square-foot residence is also driven by energy efficiency — the great room, the solarium and the master bedroom are situated on the southern exposures, while infrequently occupied spaces serve as dead-air insulation for the living spaces, the report continues.

Modern creature comforts include an updated kitchen, bathrooms and roof. The upper level of the home is dedicated to the master bedroom suite and a laundry room.

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Sliding doors between the living and dining rooms lead to a large cedar deck that overlooks the wooded property and contains a hot tub. There is also a slate patio. The property includes a greenhouse, a 687-square-foot, 2.5-car garage, and a nine-zone sprinkler system.