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 an industry average 10-year warranty -- but make sure you register or it drops to five years.
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.
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. Some other central air systems do better in this regard, including the aforementioned Lennox XC25, but this is still "one of the quietest central air conditioning units you will find, say the editors of TopTenReviews.com. 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.
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. TopTenReviews.com praises Carrier's WeatherArmor Ultra Protection and its ability to better shield the unit from the elements. "The WeatherArmor Ultra Protection is designed to increase the AC unit's lifespan and durability," says Grant Morgan. 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.
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.
Review: Carrier Infinity Series System HVAC Review, Editors of WebHVAC.com, Not Dated
The Carrier Infinity Series 24ANB1 central air-conditioning system lands in fourth place at TopTenReviews.com. "Good insulation and quality construction make this a quiet and efficient choice for your new central air conditioner, says Grant Morgan.
Review: Carrier Infinity Series 24ANB1, Grant Morgan, 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 16,000 readers and reports the frequency of repair of units bought between 2008 and 2015.
Review: The most reliable central air conditioning systems, Editors of ConsumerReports.org, May 2014
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 series is rated tops among Carrier air conditioners.
Review: Consumer Reviews of CARRIER Central Air Conditioners, Contributors to FurnaceCompare.com, As of June 2016