jeepgrady - thank you for that explanation! That makes perfect sense based on all I've read but the salesperson wasn't able to put it so succinctly!
ACFIXR - I'm sorry to be dense but I don't understand your comment! The XR13/XR14 and XP14 are all heat pumps, not blowers - right? When you say "he's talking about the blower motor model number, the new and improved not GE motor" - which 'he' do you mean? And which blower - Lennox or Trane - has the new and improved not GE motor? Were there problems with the GE motor? I'm confused but then I'm very easily confused regarding all this stuff!