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Carrier Infinity 21 24ANB1 Review

By: Carl Laron on May 24, 2017

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
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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.com 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 ConsumerReports.org owner survey, but close enough to the top finishers that the difference is not considered to be meaningful.

Our Sources

Editors of WebHVAC.com, Not Dated

WebHVAC.com is a site run by a group of former HVAC contractors that "covers just about everything to do with HVAC equipment in your home, business, or environment." The editors say the Carrier Infinity line is, "one of, if not THE, most advanced residential HVAC system on the market." However, they note that the system's top-of-the-line technology comes with a higher-than-average price tag.

Editors of ConsumerReports.org, Not Dated

ConsumerReports.org doesn't test or rate the Carrier Infinity 24ANB1, but the Carrier brand is among the ones listed in its latest survey of central air-conditioner reliability. The survey is based on responses from more than 14,000 readers and reports the frequency of repair of units bought between 2009 and 2016.

Contributors to FurnaceCompare.com, As of May 2017

FurnaceCompare.com has the largest collection of owner reviews for central air conditioners on the web. The Carrier brand as a whole gets middling reviews, with about 30 percent of owners recommending it. Most of the negative reviews focus on durability, and some also complain about customer service. However, the positive reviews praise performance and point out that problems are often a result of poor installation. Though it's based on only eight responses, the Infinity 21 series is rated tops among Carrier air conditioners.

Editors of All Things HVAC, Not Dated

The Carrier Infiniti 24ANB1 is the fourth rated system here, with its major plus being its small footprint. Though some downsides are noted, the editors, a husband and wife team of HVAC contractors, say "There's not much to say otherwise about these appliances: They work well, are sturdy and long-lasting, and have basic features like humidity control."

"Tim", Not Dated

Carrier is considered a top tier maker by this California-based HVAC contractor. Value is an issue as "Tim" holds that you can get similar performance in other brands from the same maker (United Technologies) but concedes that "Carrier is one of the gold standards in the industry, and if price is not a factor for you, this is definitely something to consider."

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