Carrier AC Units, in this case the Infinity 21, are considered a best central air conditioner because they are quiet, preserve energy when only mid-level heating and cooling are required, and are built to last. Of course, they have a higher than normal SEER rating, but a trained professional should tell you if that meets your home\u2019s needs or not.\r\nWhy We Like It - Carrier Central Air Conditioner\r\nThe Carrier Central Air Conditioner, specifically the Infinity 21 Central Air Conditioner, are great for homeowners looking for a good value on their heating and cooling needs. The Infinity 21 Central Air Conditioner comes with fantastic climate control and at a lower cost that other Carrier Series Brands.\r\n\r\nPerformance\r\nCarrier Air Conditioners contains a seasonal energy efficient rating of 21. Of course, these ratings are variable and an HVAC specialist should be able to determine what SEER unit is right for you. Residential units generally need 14-16, so 21 may be a little high. Check out the Amana Air Conditioner for something lower. The Carrier is only 65dB though, so that\u2019s a plus.\r\nEnergy Efficiency\r\nCarrier Central Air Conditioners are energy efficient models because, when air conditioning demand is low to moderate, the run at 70% capacity. Not only does this amount to energy savings, but to a quieter unit too. If you want to shop around, another high efficiency model you can check out is the Goodman Air Conditioner.\r\nFiltration\r\nSystem Carrier HVAC Systems offer MERV 15 filtration with all Infinity Series models. The advantage of MERV 15 filters is that they trap more dirt and debris that most other filters. However, be aware that these are not True HEPA filters so they won\u2019t stop as many small particles as quality air purifiers will. Unfortunately, not even the Carrier Comfort Series, which are single stage, or the Performance Series use True HEPA Filters.\r\nDurability\r\nCarrier Infinity Series Central Air Conditioning System shows few service records and fewer repair issues than most other brands which is an indicator of their quality. In fact, the Infinity Series is rated to last 20-25 years. A Carrier Installer must also receive special training from Carrier to install the unit properly. Thus, you know things like the heat pump and the boiler will be installed correctly. Can the Goodman GSX13 say that?\r\nValue\r\nAir Conditioner prices are largely determined by installation costs. As such, it\u2019s hard to give a definitive answer here on how much a Carrier Central Air Heating Cooling System will cost. However, we can tell you that it will be slightly more expensive than most concerning Carrier\u2019s great reputation but also because they spend a lot on marketing, which they have to recoup somehow.\r\nCarrier Central Air Conditioner Wrap Up\r\nWith Carrier\u2019s impeccable reputation and Carrier-certified instructors installing your unit, it\u2019s easy to see why the units will cost a little more. Maybe I\u2019m overthinking it, but I just can\u2019t justify marketing costs being part of that price, though. But if an air conditioner will last for upwards of 20 years then I\u2019ll definitely, at least, have a look.