United States shipments of central air conditioners and air-source heat pumps totaled 433,643 units in October 2014, up 19.3 percent from 363,465 units shipped in October 2013, according to the latest statistics from the Air-Conditioning, Heating, and Refrigeration Institute (AHRI).

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).

United States shipments of air-source heat pumps increased 8.8 percent in June 2014, to 283,942 units, up from 260,860 units shipped in June 2013, according to the latest statistical report from the Air-Conditioning, Heating, and Refrigeration Institute (AHRI).

United States shipments of air-source heat pumps increased 20 percent, to 265,129 units, in May 2014, up from 220,895 units shipped in May 2013, according to statistics from the Air-Conditioning, Heating, and Refrigeration Institute (AHRI).

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.

United States shipments of central air conditioners and air-source heat pumps totaled 370,582 units in January 2014, up 23 percent from 301,176 units shipped in January 2013, according to Air-Conditioning, Heating, and Refrigeration Institute (AHRI) statistics. 

The numbers support the growing consensus in the industry that things are definitely improving. 

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).