My electricity rates are between 2.9-5.9 cts/kwh and current central air is 2.5 ton 8.2 SEER over 25+ years old in a 1200 sq ft house in Illinois with old windows (in process of replacing). I have decided on a company and product however if I upgrade to the XB14, I can get a utility rebate. With the rebate, the cost isn't much more... about equivalent of 2-3 months utility bills. I'm trying to determine how much more efficient the XB14 is over the XB13 though. The Trane website isn't of much help aside from an extra 1/2" or so of orange bar next to "efficiency" lol. They do say the XB14 is energy star rated and the XB13 isn't.
Any help with this one?