If anyone can give some feedback or advise on the Lennox XC25, I would greatly appreciated it. We are looking at replacing to 3.5 TON units in Arizona (two story 3,100 sq ft). We received a quote today for two 4 Ton XC25 that was pretty pricey, but maybe I just don't know what to expect. Each split system (attic) unit installed is coming in just over 12k. Is that in the ball park of what I should expect? I have made a call to get a second local opinion, but thought I should also do my homework online as well. Thanks in advance if you are able to assist with my research.