Built for total home comfort, Carrier® Infinity® Series central air conditioners offer an enviable SEER rating of up to 19. This model is the most efficient air conditioner for starters. Add to that the fact that its two-stage compressor can make a real comfort difference when it comes to managing indoor humidity.

Two-stage compression lets the system bring the cool when it's needed but allows it to function mostly in low-stage, where you get the highest efficiency and the best dehumidification due to longer run times. It's also quieter in low stage.