I have decided to replace a 26 y.o.100K input Whirlpool gas furnace with ac in central N.J. This set up has served me well in the 7 yrs I have been in this house. My background is in Commercial/Industrial and I do not have the skills to do the tin work, so I enlisted a former co worker and mentor who is now in his own business to do the job. We agreed on a Ruud UGPR07EAMKR furnace with a UAPM030JAZ condenser, I don`t have the coil model #. My question is: I see the furnace has an ECM motor, are all of these VS? The spec sheet shows it has 4 speed taps so I am thinking no, with that in mind are there any real advantages to this furnace over an induction blower 2 stage 80%? If so please point them out to me. Lastly does anyone have a history with these they are willing to share?