Combined U.S. factory shipments of central air conditioners and air-source heat pumps for April totaled 559,774, up 7 percent from April 2006 shipments, the ARI reported.

The Air-Conditioning and Refrigeration Institute also said that year-to-date combined U.S. factory shipments totaled 2 million, down 24 percent from the same period last year.

Heat pump shipments for April totaled 164,585, down 0.2 percent from April 2006 shipments. Year-to-date heat pump shipments totaled 613,708, down 17 percent from the same period last year.