Year-to-date U.S. shipments of commercial gas storage water heaters decreased 0.1%, to 54,805 units, compared with 54,833 units shipped during the same period in 2010. Year-to-date commercial electric storage water heater shipments increased 1% to 40,296 units, up from 39,835 units shipped during the same period in 2010.

U.S. shipments of gas warm air furnaces for August 2011 decreased 9%, to 181,771 units, down from 199,402 units shipped in August 2010. Oil warm air furnace shipments decreased 6%, to 3,435 units in August 2011, down from 3,636 units shipped in August 2010.

Year-to-date U.S. shipments of gas warm air furnaces decreased 8%, to 1,313,610 units, compared with 1,426,017 units shipped during the same period in 2010. Year-to-date U.S. shipments of oil warm air furnaces decreased 11% to 25,352 units, compared with 28,413 units shipped during the same period in 2010.

U.S. shipments of central air conditioners and air-source heat pumps totaled 517,864 units in August 2011, up 18% from 439,551 units shipped in August 2010. U.S. shipments of air conditioners increased 24%, to 371,157 units, up from 300,046 units shipped in August 2010. U.S. shipments of air-source heat pumps increased 5%, to 146,707 units, up from 139,505 units shipped in August 2010.

Year-to-date combined shipments of residential central air conditioners and air-source heat pumps increased 13%, to 4,417,192 units, up from 3,899,259 units shipped in August 2010. Year-to-date shipments of central air conditioners increased 17%, to 3,052,281 units, up from 2,618,762 units shipped during the same period in 2010. The year-to-date total for heat pump shipments increased 7%, to 1,364,911 units, up from 1,280,497 units shipped during the same period in 2010