ARLINGTON, Va. — Total combined United States shipments of central air conditioners and air-source heat pumps increased 9.9 percent, to 6,169,700 units in 2013, up from 5,613,665 units shipped in 2012, according to statistics from the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). Total 2013 shipments of central air conditioners increased 7.3 percent, to 4,201,068 units, up from 3,915,869 units shipped in 2012. The 2013 total for heat pump shipments increased 16 percent, to 1,968,632 units, up from 1,697,796 units shipped in 2012.

U.S. shipments of central air conditioners and air-source heat pumps totaled 306,141 units in December 2013, up 8.2 percent from 282,840 units shipped in December 2012. Shipments of central air conditioners increased 2.3 percent, to 186,484 units, up from 182,323 units shipped in December 2012. Shipments of air-source heat pumps increased 19 percent, to 119,657 units, up from 100,517 units shipped in December 2012.