According to the Air-Conditioning, Heating, and Refrigeration Institute (AHRI), shipments of commercial gas storage water heaters decreased 7 percent in January 2011 to 6,138 units, down from 6,598 units shipped in January 2010. Shipments of commercial electric storage water heaters increased 6 percent in January 2011 to 4,381 units, up from 4,120 units shipped in January 2010.

Warm-Air Furnaces
U.S. shipments of gas warm-air furnaces for January 2011 increased 13 percent to 190,798 units, up from 169,024 units shipped in January 2010. Shipments of oil warm-air furnaces decreased 7 percent to 5,237 units in January 2011, down from 5,609 units shipped in January 2010.

Central Air Conditioners and Air-Source Heat Pumps
U.S. shipments of central air conditioners and air-source heat pumps totaled 324,027 units in January 2011, up 4 percent from 311,075 units shipped in January 2010. U.S. shipments of central air conditioners increased 2 percent to 197,416 units, up from 193,849 units shipped in January 2010. U.S. shipments of air-source heat pumps increased 8 percent to 126,611 units, up from 117,226 units shipped in January 2010.