ARLINGTON, Va. — Combined United States shipments of central air conditioners and air-source heat pumps totaled 638,572 units in March 2014, up 11.9 percent from 570,434 units shipped in March 2013, according to Air-Conditioning, Heating, and Refrigeration Institute (AHRI) statistics. U.S. shipments of central air conditioners increased 9.7 percent, to 415,218 units, up from 378,608 units shipped in March 2013. U.S. shipments of air-source heat pumps increased 16.4 percent, to 223,354 units, up from 191,826 units shipped in March 2013.

Year-to-date combined shipments of central air conditioners and air-source heat pumps increased 14.4 percent, to 1,406,017 units, up from 1,229,247 units shipped in March 2013. Year-to-date shipments of central air conditioners increased 10.4 percent, to 871,826 units, up from 789,588 units shipped during the same period in 2013. The year-to-date total for heat pump shipments increased 21.5 percent, to 534,191 units, up from 439,659 units shipped during the same period in 2013.