US shipments totalled 424,102 units in January 2016, down 11.6% on January 2015. This followed a 17.2% fall in December, which saw total 2015 figures for central air conditioners and air-source heat pumps drop 0.6% to 6,815,072 units.
Broken down by sector, air conditioner shipments decreased 10.7% in January to 257,616 units. This was down from 288,361 units shipped in January 2015. Shipments of air-source heat pumps decreased 12.9% to 166,486, down from 191,123 units shipped in January 2015.
The AHRI defines a shipment as when a unit transfers ownership; a consignment is not a transfer of ownership. Previous monthly shipment releases and historical data can be found here.