I have to agree with other FReepers on a couple of things. Who does the installation matters. Also, this price seems WAY high. We had TWO complete Trane systems (both heat/AC) installed seven years ago for less than $13K. That included doing some extra “stuff” to the system we wanted done. Both are fairly large units, because it’s a big house. Trane is a great brand, and we love ours, but they are a little noisy, if that matters to you.
Even though we have used this company for the last two installations and be believe them to be honest, it is definitely time to get two more bids.