Philadelphia Plan, [a six-year plan launched in 2009 with the goal of making Philadelphia the greenest city in America], meant there was a strong desire on the Committee’s part to find an inventive, green building solution to this challenge.” Mark B. Thompson Associates, Inc., Philadelphia, designed a closed loop geothermal system using water source heat pumps with a 4-pipe system to deliver either hot or chilled water to fan coil units throughout the building. The existing steam boiler, radiators and piping system were also to be restored to provide backup heating. The Committee awarded the restoration contract to W.S. Cumby, Inc., a general contracting firm in Springfield, Pa. W.S. Cumby asked Carter Mechanical, Paoli, Pa., to bid the 4-pipe system as designed. Carter ad

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