What are some highly rated Carrier AC units?

Some highly rated Carrier air-conditioning units include the Performance series and the Infinity series, notes Top Ten Reviews. The Infinity series has an energy efficiency rating of 21, while the Performance series has a rating of 17, making it 20 percent less efficient, notes ASM.

The Infinity series has a noise level of 65 decibels while the Performance series has a noise level of about 72 decibels, which is not much of a noticeable difference. The Carrier Infinity model is more expensive than the Performance series, but if the person installs it in a home he lives in for more than 10 years, the energy savings make up for the initial cost.