I'm getting a new AC and Heating system installed. I'm told there is a $ increase in price, for the whole system, if I choose the Carrier 58CVA110-20 vs. the 58STA110-16. For the AC, I'm going with the 24ABB348 which is a 13 SEER.
The 58CVA is a 2-stage furnace w/ a variable speed blower motor. Is this really worth the extra $? Is it going to help at all in the summer with the AC, in terms of improving some of the rooms that don't get enough cooling, or just help in the winter with rooms that don't get enough heat? What are my savings really going to be in both the winter and summer with the 58CVA versus the 58STA?
Another thing, is the contractor doesn't really plan on installing an extra wire for the, so, would I still get benefit of the variable speed blower without the extra wire?
Important: I need to be assured that a variable speed blower won't make my AC work worse in terms of problematic rooms versus the rooms that get the most cooling. Will the AC work at least as well as it currently does for the problematic rooms with a variable-speed blower? Does variable-speed ever make AC work worse for problematic rooms?
ADD: I also have the option of a Carrier 2-stage furnace without variable speed blower which I assume is going to be midway between cost of 58CVA and 58STA....would 2-stage without variable speed be worth considering?