hello got a few questions if someone help?

i work commerical service with some installs here and there. i worked residential for about 3 months so not to familar with the products out there.

this is for my parents, but i have a 30 year old GE heat pump that i need to replace.

Model Number
First letter is either a P or R CWF63OG1F03

serial number
382424-244

Electric heat number
BNHE000G1B19
19.2KW

Condenser Model BGWA830R1A SERIAL 250625303

IM I right to say the the 30 in the model number is the tonnage?

I would like to get a american standard or trane to replace, my company is a carrier rep

the old ge unit pulls from the front with no duct hook up to it because it pulls from the basement and everyroom up stairs has a return in it that goes down threw the wall and opens up down stairs

height for the new unit is and issue i only have 74 3/4 from ground to duct work, my question is would i be better off getting a unit that sits on the ground and put a filter grill and register on the side of the unit and make a new transition to the duct work.

any advice would be helpful thanks? or any pdf files on trane and american standard residential units

thanks