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A ............. on the roof provides electricity from sunlight.
photovoltaic panel
The builders used ....... tires to create strong, eco-friendly walls.
scrap
Our home is partly underground—it's an ........... house.
earth-bermed
We installed .......... on the ceiling to let in more natural light during the day.
skylights
The ............... collects water from the roof when it rains.
rainwater harvesting system
This house is completely ........ and uses no public utilities.
off the grid
The ...... wall in the living room looks beautiful and also helps control heat.
bottle
Concrete floors have great ....... mass and help keep the house warm at night.
thermal
They decided to ....... old wood to make furniture for the new house.
repurpose
A thick stone wall can act as a ........ and release warmth slowly.
heat sink
