I have Trane 80 ER furnaces about 12 years old and they work well. All three of my Trane central air units have leaks and I am told should be replaced.

One person is recommendind Amer Standard Heat pumps Heritage 14 and says my exisiting unit will not get the effeciency from the American Standard 15 Heritage.

Another dealer is recommending the Trane XLI5i which has a SEER rating of about 15,, which, if I believe the first guy really will not deliver the effeciency.

On top of that my research saysd that the Amer Std 15 is quieter and much more efficient.

Do I go with the 14 or 15 American Std or the Trane and if the Trane the 14 or 15