We're about ready to purchase a new Bryant or Carrier HVAC system to replace a 35 year old Carrier furnace and a 10 year old York a/c.
We plan to replace the furnace with either the Bryant Evolution 2 stage variable speed, etc. or the Carrier Infinity -- we understand they're both really the same items since they're owned by one company.
The question is about which a/c unit to get. Our house has three levels (typical colonial) on three levels including a finished basement. Location is mid-Atlantic region. Two dealers are recommending a two-stage a/c (which obviously will work better with the Evolution or Infinity control). HOWEVER, a third dealer said that since my house was ducted with a single trunk across the basement ceiling which feeds the basement, first and second floors (through the walls and individual intakes and outlets in each room in the house) that we would find that in order to cool the second (top floor), that we would freeze on the first floor because of the way the 2 stage system works. He explained that the first stage would come on first with 1/2 the blower power (because the blower is also coming on at it's lowest setting), and the second stage wouldn't kick in until it got really warm upstairs, at which point in order to cool the second floor, we'd freeze on the first floor. IS THIS GUY CORRECT?
For the past 35 years, (yup, we've been in one house for 35 years!) we've closed off the louvers in the basement and on the first floor in order to "force" most of the cool air upstairs.
Another problem seems to be that there are virtually no single stage 15 seer a/c unit to be had in this area or nearby at the moment. One dealer checked and said that there are two in Texas (a fur piece from here) but that those dealers wouldn't give them up.
How do I decide who's right? Should I insist on a one stage a/c unit or get the two stage one?