AHRI recently released the September 2013 data on U.S. shipments of heating and cooling equipment. For September 2013, warm air furnaces are up 6.8%, driven by gas furnaces. Oil furnace shipments are down for this time period. YTD warm air furnaces are up 17.4%. Air conditioning and heat pump shipments were also up for September at 17.0% combined. YTD these units are up 9.6% driven by a 15.9% increase in heat pump shipments. Click here for the full report: AHRI Shipment Data.