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passive house te studio architecture tim eian passivhaus intep design net zero custom home tim delhey eian integrated planning enerphit retrofit minneapolis carbon neutral lecture sustainable home passive house in the woods house passive house minnesota passive green home building design cold climate energy retrofit comfort energy efficiency building high performance sustainability stephan tanner introduction wisconsin energy deep reduction eian tim studio te passive house plus electricifcation carbon neutrality resiliency zero energy ready home climate action leed ashrae building standard codes climate change phmn energy efficient real estate minnephit case study synergy living green expo 2009 minnesota aia convention living building challenge 2009 conference enterprise green communities giga reset iwbi well energy star green b3 conference sb2030 architecture 2030 heat pump solar energy energy conservation portfolio project nordeast nest new construction urban home low energy zero energy custom design passive house retrofit green design better business better buildings german engineering engineering home design home remodel first commercial deep energy reduction retrofit minnesota low carbon la crosse decarbonize the studio university energy plus green communities minnesota code carbonneutrality zero energy home hudson net-zero