The Infinity 19VS is different in a lot of ways. It offers variable-speed compression that can step down in 5 stages to as low as 25% of its capacity. That's huge from a comfort perspective. The ability to run in lower speeds most of the time makes it quieter and more adept at removing humidity and keeping temperatures even. Plus, those lower speeds are the sweet spot for the unit's best efficiency levels and for getting the most benefit out of other systems you might have like an air purifier because of more constant air flow through the system.
 
And, it's seldom you can upgrade your system a component at a time. Most often, the leap to higher efficiency and better comfort via a communicating system for that home you love can mean you have to deal with the cost of a whole system even though only your AC has called it quits. The Infinity 19VS  could change that for you. Your Carrier® expert can help you determine if it can work with your existing indoor unit so you can upgrade in steps.