Consumers prefer Carrier units over Trane systems due to their superior performance in energy efficiency, noise production and heating power. However, both Carrier and Trane are popular air conditioner manufacturers, as of 2015.
Consumers prefer Carrier air conditioning units for their low noise production. The best Trane systems produce sounds of 72 decibels, at their lowest level. Carrier models can perform with sounds as low as 65 decibels. Carrier units also have up to 86 percent more heating power than their competition, making for an efficient heating source during winter.
Energy efficiency ratings are given as a seasonal energy efficiency ratio (SEER). Carrier air conditioning units outperform Trane units on energy efficiency. This difference accounts for significant savings on energy bills.