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She tells us the south-facing atrium acts as a solar collector with its large, glass windows.

That means the solar collector must concentrate the Sun’s heat more effectively.

“While the cost of a solar collector can be high, using the collector to heat other buildings at other times of the year makes it more cost-effective.”

You don’t have to build anything, you basically just throw a seed on the ground and your solar collector grows out of thin air.

She told all this while sitting on a bench on a recent weekday, as Watson hoisted himself up a 120-foot ponderosa pine, a solar collector slung on his hip, to put in the last installation.