The Air-Conditioning and Refrigeration Institute (ARI) announced that combined U.S. factory shipments of central air conditioners and air-source heat pumps for September 2007 totaled 527,516, up 4.75% from September 2006, and year-to-date combined U.S. factory shipments totaled 5.3 million, down 10.8% from the same period last year. Heat pump shipments for September totaled 156,617, down 3.4% compared with September 2006 shipments, and year-to-date heat pump shipments totaled 1,544,260, down 11.6% from the same period last year.