After getting some quotes and talking to some pros I still cannot tell who is a great contractor and who isn't.
One said Lennox is at the forefront of innovations. Second said Carrier is 7 years ahead of everyone. Third one said Trane beats all. One said Trane coils are impossible to clean. Second agreed. Third said - baloney - Lennox and Carrier coils are the worst to clean. So brands are impossible to chose by talking to contractors - each pushes their own.
Some send salesperson, who is smooth and knows a lot, well-dressed and pleasant. Sometimes owners come out. Often they are less polished, but I give them more credibility, but they can be rough around the edges.
Therefore, I'd like to know how to tell a good contractor from an average one? (Bad ones I can see already - "what's a condensing furnace" one asked me). What questions should I ask and what answers should I hear?
I know about doing Manual J calc. But what else?