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PURE ON: The manufacturer says Infinity System is the first to use a single control to integrate and manage temperature, humidity, airflow, ventilation, indoor air quality, and zoning. It also provides longer heating and cooling cycles at lower fan speeds for energy savings and consistent temperatures, the maker says. It has an automated diagnostic feature that monitors the system, a variable-speed fan, and a non-ozone-depleting Puron refrigerant. Carrier Corp. 800-227-7437. www.carrier.com.

PURE ON: The manufacturer says Infinity System is the first to use a single control to integrate and manage temperature, humidity, airflow, ventilation, indoor air quality, and zoning. It also provides longer heating and cooling cycles at lower fan speeds for energy savings and consistent temperatures, the maker says. It has an automated diagnostic feature that monitors the system, a variable-speed fan, and a non-ozone-depleting Puron refrigerant. Carrier Corp. 800-227-7437. www.carrier.com.

HIGH EFFICIENCY: The SEER 19.50 XL19i line of air conditioners and heat pumps has one of the highest energy-efficiency ratings on the market. The unit features dual compressors, a variable speed outdoor fan motor, and an all-aluminum spine fin coil that provides low airflow resistance, greater heat exchanging capabilities, and more resistance to corrosion and leaks, the company says. Trane. 903-581-3033. www.trane.com.

HIGH EFFICIENCY: The SEER 19.50 XL19i line of air conditioners and heat pumps has one of the highest energy-efficiency ratings on the market. The unit features dual compressors, a variable speed outdoor fan motor, and an all-aluminum spine fin coil that provides low airflow resistance, greater heat exchanging capabilities, and more resistance to corrosion and leaks, the company says. Trane. 903-581-3033. www.trane.com.

SMALL TIME: This 13 SEER [mc]2 air conditioner is the smallest 13 SEER air-conditioning system in the industry, its manufacturer says. It is available in 1- to 3-ton sizes and is ideal for applications where space is limited. The unit has an aluminum-tube coil, and a polymer mesh and coated steel coil guard protect the condensing coils. Luxaire Corp. 405-364-4040. www.luxaire.com.

SMALL TIME: This 13 SEER [mc]2 air conditioner is the smallest 13 SEER air-conditioning system in the industry, its manufacturer says. It is available in 1- to 3-ton sizes and is ideal for applications where space is limited. The unit has an aluminum-tube coil, and a polymer mesh and coated steel coil guard protect the condensing coils. Luxaire Corp. 405-364-4040. www.luxaire.com.

SPLIT UP: The ultraquiet and compact 13 SEER high-efficiency unitary split air-conditioning systems range from 1.5 to 5 tons and are sized for slab or rooftop mounting in single or multifamily homes. The units have some of the smallest footprints in the industry, the company says, so they are economical to transport and install. Each unit features a factory-installed liquid line filter dryer and copper-tube, aluminum-fin coil construction. Fedders Corp. 908-604-8686. www.fedders.com.

SPLIT UP: The ultraquiet and compact 13 SEER high-efficiency unitary split air-conditioning systems range from 1.5 to 5 tons and are sized for slab or rooftop mounting in single or multifamily homes. The units have some of the smallest footprints in the industry, the company says, so they are economical to transport and install. Each unit features a factory-installed liquid line filter dryer and copper-tube, aluminum-fin coil construction. Fedders Corp. 908-604-8686. www.fedders.com.