Here is a quote I received from a local Trane dealer:

Trane TUD080R9V3 variable speed 2 stage (XV80), 80% AFUE, 80k BTU; Aspen Coil; Trane 2.5 ton condenser 4TTX5030A1000A, 16 SEER.

Quote = $5400 (all inclusive)

It is eligible for total of $1500 fed tax credits. In addition to the above the quote also included replaceing the lineset and return drop.

So the total cost will be $5400 - $1500 = $3900. Is this a competetive deal? Appreciate your thoughts & feedback.

As others have said, on a new install why not use a Trane coil? The Trane unit may be from their 16seer line, but actual performance will depend on the coil match.

Be sure that the units are matched -ask for an ARI certificate - it will list the SEER for that combination.

[I am going to go add a sample certificate to the website noted below right now.]

Always get more than one estimate/quote.

I have some forms and guides you may find useful at the link below.
Check out #2 the Contractor Score Card from ACCA. It gives an easy way to compare quotes, helps you ask the right questions and evaluate the answers.

Andy