Ingersoll Rand bought Trane about 7 or 8 yrs ago. They went right into the '08 crash as new owners. They made a lot of changes and many dealers moved over to other brands. It happens. In the northeast, where I live, I think Carrier was the chief beneficiary of the dealer migration.

Do your own research and discuss your proposed preferences with him. He will either get you to change to his brand or not. I expect he will install whatever you want.

Interesting about the change in ownership. It is possible that the product changed significantly. But such changes often prove be to be unwise. Damage to a reputation is very difficult to repair.