The quest for home utility bills of…zero

SANTA CLARITA, Calif.— The KB Home KBH, -0.69% development here looks like any other middle-class subdivision in Southern California — rows of stucco houses with tiled roofs and two-car garages—except for the sticker on the entryway of one of its showcase units.

The sticker displays the average monthly cost to heat and cool the home and run the appliances: $119, compared with $252 for a standard-built home of similar size. If an owner adds solar panels, the monthly bill would drop to near zero.

Buried inside the extra-thick walls of these homes are layers of high-density fiberglass insulation flanked by rigid foam boards taped together at the seams to forge a thermal barrier.

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