First off go for the highest efficiency trane makes, isnt that 93% or
so, your overal efficency is the most important number. For a VSDC motor
get the 10 yr warranty, even though the GE motors are redesigned there
is no telling how long they last. VSDC is great but at your electric
rate today you will only likely have a 500$ payback in 6 years and that
is Not running it 24x7. But the extra humidity removal when used
properly, having it kick on low speed will make the VSDC worth it. You
probably need a special humidistat-thermostat to make it run correctly.
Of course electricity is going up everywhere so your overall savings on
a VSDC being 10-25% more efficient make it a smart purchase, as long as
you bought the additional 10 yr warranty, which is often free if you
negotiate