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Although the premium cost of making a new home net-zero,
. . . is currently between 7% and 8%,
. . . the cost is expected to drop in half by 2030, according to a
. . . 2019 study by the Rocky Mountain Institute.

A Green home might include the following systems:
. . . . . . photovoltaic array with batteries,
. . . . . . wood stoves that exceed EPA emissions, and efficiency requirements,
. . . . . . compact and ultra-efficient appliances,
. . . . . . super-insulated walls, basement, and ceiling,
. . . . . . optimized HVAC mini-split system with an ERV,
. . . . . . glazed windows,
. . . . . . skylights with summer shades,
. . . . . . recycled siding; and
. . . . . . low-flow toilets.

2-15-2019 Source:  Costs Drop in California #Net-Zero