Peter Amerongen (left) of Habitat Studios the builder of Bob Heath’s net-zero home built in Edmonton, Alberta.

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Peter Amerongen (left) of Habitat Studios the builder of Bob Heath's net-zero home and the original Riverdale net-zero home built in Edmonton, Alberta. Photo David Dodge

Peter Amerongen (left) of Habitat Studios the builder of Bob Heath’s net-zero home and the original Riverdale net-zero home built in Edmonton, Alberta. Photo David Dodge