For a major overhaul, consider installing photovoltaic cells on your roof, hydronic radiant heating in your floors, double-glazed panes in your windows and low-flow toilets in your bathroom.

FORBES: Julia Cosgrove

The hexagonal home built of honey-colored swamp wood and sandstone includes features he invented - radiant floor heating and the carport - plus Wright-made furniture.

BBC: From Warhol to Wright: An arty trip through Pennsylvania

The laundry list of green features of each Oil Silo Home is exhaustive: super-thick insulated wall panels, rainwater recycling systems, rooftop gardens, natural ventilation, EV charging stations, radiant floor heating, green walls, and the list goes on and on.

FORBES: Written by Matt Hickman