Just trying to see if this is way out there. Live in oregon, 2 story 2700sqft home built in 1993. Full system replacement quote from Very reputable trane dealer who did a load calc.
AC unit - XV20i - 3 ton
Xc95m 60,000 btu gas furnace
Comfortlink ii thermostat xl950
3 new returns installed
Trane Clean effects air cleaning system
All permits , new lines and new vents
10year labor warranty

Installed for $21,000
Does this sound like a reasonable price? I know it is tranes top of line system. Also does the ac and furnace seem properly sized? Even though he did a calculation it just want to be sure we get enough. Thanks for your input.