Does this sound acceptable to you guys?
Due to factory rebates and dealer discounts and the 30% Federal Tax credit, a Carrier Infinity system 2 ton ac (Infinity 17) with the 95% 58MVC060-14 furnace is actually cheaper than other options with an 80% variable speed furnace and a Performance Series AC unit (at least from this particular dealer).
However, the salesman says that the 95% furnace is very sensitive to return airflow. The furnace is located in the basement and services the first floor of my two story house. There is one return on the first floor. It's about 24 inches x 6 inches. The salesman is suggesting putting a 2nd return in the basement to insure proper airflow back to the furnace.
It seems to me that instead of heating the first floor, I'll now be heating the basement also since the only way to pull air into the basement is from the first floor.
Is this a common solution? I'm not sure I like the idea of a second return on a different floor for a system that is supposed to be for the first floor only.
The 95% furnace is really overkill, our gas bills are low already, but like I said at the beginning, it's actually cheaper than some of the other options with lesser grade equipment. However, I'm worried about the fact that if I end up heating two floors with the 95% furnace, my gas bill may not be any cheaper than it is now, even with a more efficient furnace.