Combined U.S. factory shipments of central air conditioners and airsource heat pumps for May totaled 739,647, up 8.5 percent from May 2006, ARI reported.

The Air-Conditioning and Refrigeration Institute said that year-to-date combined U.S. factory shipments totaled 2.6 million, down 17 percent from the same period last year. Heat pump shipments for May totaled 198,911, down 4.6 percent from May 2006 shipments.

Year-to-date heat pump shipments totaled 812,619, down 14 percent from the same period last year.