I'm replacing a Trane XE900 with a Carrier Infinity 14 seer system. I'd give the numbers, but most are illegible. The Carrier rep calls it a true Infinity system as both the AC and furnace are being replaced with Infinity models. A six month box filter unit is also being added and the Infinity thermostat. I'm also replacing 90% of the ductwork for $8500. It's an 18 yo 2700 sf brick house in Dallas with about 10" insulation in the attic.

I guess I want to know this is a good deal and will drastically cut our $400 summer ac bill.

The rep keeps referring to this as 14 seer Infinity system, but there website says 18 seer. Can someone explain that?