ARLINGTON, Va. — United States shipments of central air conditioners and air-source heat pumps totaled 539,628 units in September 2014, up 29.7 percent from 416,179 units shipped in September 2013, according to the latest statistics from the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). U.S. shipments of central air conditioners increased 22.9 percent, to 348,143 units, up from 283,307 units shipped in September 2013. U.S. shipments of air-source heat pumps increased 44.1 percent, to 191,485 units, up from 132,872 units shipped in September 2013.

Year-to-date combined shipments of central air conditioners and air-source heat pumps increased 8.2 percent, to 5,599,693 units, up from 5,176,909 units shipped during the same period in 2013.Year-to-date shipments of central air conditioners increased 4.2 percent, to 3,713,244 units, up from 3,563,835 units shipped during the same period in 2013. The year-to-date total for heat pump shipments increased 16.9 percent, to 1,886,449 units, up from 1,613,074 units shipped during the same period in 2013.