Combined U.S. factory shipments of central air conditioners and air-source heat pumps for November totaled 231,995, down 33 percent compared with the same month last year, according to AHRI.

The Air-Conditioning, Heating and Refrigeration Institute also reports that for the year-to-date, combined shipments totaled 5.5 million, an 8 percent drop compared with the same period last year.

Heat pump shipments for November totaled 95,506, down 21 percent from the same month a year ago. For the year-to-date, heat pump shipments totaled 1.7 million, a 0.8 percent drop compared with the same period last year.

U.S. factory shipments of gas-fired, warm-air furnaces in November also saw a drop. They totaled 200,502, down 20.7 percent compared with the same month a year ago. Oil-fired, warm-air furnaces for the same month totaled 5,349, down 38.5 percent compared with November 2007 totals. For the year-to-date, gas furnace shipments totaled 2.1 million, an 18 percent drop compared with the same period last year. Oil furnace shipments for the year-to-date totaled 53,368, a 29.3 percent drop compared with the same period last year.

Residential electric water heater shipments for November totaled 280,019, a 24.2 percent drop from the same month a year ago. Residential gas water heater shipments totaled 260,443, a 26.8 percent decrease compared with shipments for the same month last year. For the year-to-date, about 3.6 million residential gas water heaters have been shipped, a 7.7 percent drop compared with the same period a year ago.