That is why I replaced my Carrier Air V with an Advent Air, I think it's Coleman also makes one.. They are "Drop on" replacements.
The job required.. REmove inner cover and 4 bolts, pull off rooftop unit and gasket, replace gasket and roof top unit and 4 new bolts.
Open control board housing, remove ONE connector (Molex socket) and pigtail, replace with a new one.
Connect "Y" connector in the adapter kit and plug rooftop unit into the "Bottom" of the Y.
Replace inner cover.
That's all folks.. Same T-Stat (Well remote control) same controls, from the inside it is the same unit (Literally, not "Just like" but the exact same right down the the serial number) The part in the ceiling/roof that feeds the ductwork,, is also the same,, Only the part visible from roof, and that one pigtail, changed. (Oh and the bolts, they included new bolts, so we used them).
One other change, 15000 instead of 13,500, Current draw however, remained 13.5 amps.