I have a 5 to 7 year old Carrier furnace for very cheap

115 v Vertical up flow design
input 63000 btu
3.5 " wc natural gas
35-65 deg air temp rise
spark ignition and
direct drive (no belts)

I will not install this unit so don't bother asking. However I removed the unit while it was working well. It was removed due to demo sale and serviced a 2000 Sq ft home and should have 15 year life left.