i think the xl14i is being phased out. it was mainly an r-22 set up. the xl15i is the 410a system trane is pushing. the best way to find out if the units are comparable is to get the dealers to include the a.r.i. # and you can compare them your self.
"When the people find they can vote themselves money,that will herald the end of the republic" - Benjamin Franklin
"Government is not reason, it is not eloquence, it is force;like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action"- George Washington