Combined U.S. factory shipments of central air conditioners and air-source heat pumps for September totaled 512,314, down 38 percent from the same month last year, according to ARI statistics.

The Air-Conditioning and Refrigeration Institute also reported that heat pump shipments totaled 170,042, down 15.7 percent for the same month last year, but up 9 percent from the nine-month period of January through September 2005.

U.S. factory shipments of unitary air conditioners and heat pumps had a year-to-date total of 5.9 million, down 10 percent for the same nine-month period in 2005.