PHILADELPHIA—It was an unseasonably warm spring day, and Jackie Robinson was keen to show off a machine that many climate advocates say is the cooling technology of the future. “Welcome to my heat pump lab,” Robinson said. “Come on in.” Robinson’s lab, buried inside a sprawling former factory in Philadelphia’s rough-and-tumble Kensington neighborhood, contains a … Continue reading As Federal Incentive Rollbacks Loom, Could the Heat Pump Revolution Stall Out?