I've got 6 HVAC contractors coming on Friday to give me estimates on changing out my HVAC system. Two from Trane, Two from Carrier and two fron Bryant. Me and wife are in disagreement on weather to ask for a customer list on the front end. She thinks we should ask for that list after getting a written estimate so we won't make them mad and jack up the price which also brings up the question as to weather I should play it dumb when they come or be very specific on what I expect such as doing an audit to size the units properly, customer list. I do plan on telling them that I want a 16+ SEER and 92+AFUE split dual zoned system as a general guide. Just not sure how much detail to go into?