How homebuilder Sustainable 9 built a green sales machine (photos)

Two brothers from Minnesota are creating a buzz in the Twin Cities homebuilding industry with a line of energy-efficient and eco-friendly luxury homes. Minneapolis-based Sustainable 9 Design and Build specializes in building and remodeling custom green homes by using an array of materials and appliances, from the most advanced wall insulation substances on the market to installing solar panels on roofs or making homes capable of having solar panels. Brothers Chad and Ryan Hanson, former Realtors…

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