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- [1] The author's longtime interest in bundling efficiency techniques in a single system eventually led him to a new pairing: Vrf zoning technology and geothermal design. see how he got there and how this couple played out for an historic 107-year-old iowa courthouse that serves the law through the area's brutal winters and humid summers [J]. Engineered Systems, 2013, 30 (02): : 44 - 50