We needed to replace our 20 year-old central heating/air system. We had several companies come out for estimates. All estimators except for Wolfgang's just quoted us based on our existing system, and sent quotes without presenting any other information. But John from Wolfgang's came out and actually sized the system (I think it's called an HVAC load calculation) for the house. He also walked us through several system options, and he'll go into as much detail as you want, and left us with a nice chart/price sheet of systems to consider.
We decided to go with Wolfgang's. You have to make a 50% down payment to get on the schedule, with the remainder due at installation. They were busy so we had to wait about 10 days for the installation.
The two-person installation team (Khris and Cody) arrived on time and was respectful of the property. We liked that they put on booties whenever they were in the house. I had a few questions and concerns during the installation and they were happy to answer my questions. The installation took about 8 hours. And before they left they cleaned up everything inside the house and at the attic access in the garage.
About a week later John came back to look at/check the installation and answer any questions we had.
So far everything is good and we're happy to be ready for the summer heat.
Wolfgang's is a certified Trane dealer/installer and I think that is all they sell.