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Carrier Infinity 21 24ANB1 Review

By: Carl Laron on May 01, 2018

Bottom Line

The Carrier Infinity 21 24ANB1 is more efficient and quieter than most models on the market. It also gets bonus points for its good dehumidifying power. Carrier's reliability record is fairly strong, too. It's covered by a 10-year warranty -- but make sure you register or it drops to five years.


  • SEER up to 21
  • Very quiet
  • Good dehumidifying power
  • Good reliability record


  • Some other systems are more energy efficient
Our Analysis

Breaking it down


Great efficiency. Though it lacks the modulating compressor found in some central air conditioners, such as the Dave Lennox Signature XC25, the two-stage compressor in the Carrier Infinity 21 24ANB1 does a great job nonetheless in controlling humidity and maintaining temperatures. Performance is best, however, when paired with a variable speed blower and Carrier's Infinity control system. The Carrier Infinity 21 24ANB1 is rated for a maximum SEER of 21, and EER of 15, and all sizes are Energy Star qualified.


Whisper quiet

One significant pro is the noise level of these air conditioners, which is well below average. The 24ANB1 runs at as little as 65 decibels -- only a bit louder than conversation in normal voices, though some other central air systems, such as the XC25, do better in this regard. The optional Infinity control thermostats are available in Wi-Fi enabled versions that let you control your 24ANB1 via Apple or Android smartphone and tablet apps. All Things HVAC likes that relatively small footprint, saying that "Carrier Infinity manufactures the best rated central air conditioners that can fit in small spaces."

Maintenance and repair

Solid build quality, brand reputation. In their review of the Carrier Infinity 24ANB1, the former HVAC contractors at WebHVAC praise this brand's reliability. "Carrier has one of the industry's top service records," they say. One downside of the Carrier Infinity air conditioner, though, is its warranty. It's at the low end of the industry standard at 10 years. Like most brands, Carrier insists that you register the warranty, in this case within 90 days, otherwise you risk having it cut in half. Carrier finishes in the middle of the pack in the Consumer Report owner survey, but close enough to the top finishers that the difference is not considered to be meaningful.

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