It's still working after 20 years, but I just bought the house last year and
want to replace entire 2 zone system before it dies. Three reputable local
outfits have presented quotes (in 10-15K range) for a 3 ton and a 1.5 ton.
Of the three only one explicitly mentioned replacing the 20-year old R22
line sets with new, the other two said nothing about this. Since the
upstairs unit's plumbing runs inside walls the one man proposed an R22 unit
there, but the others want to use the new 410 refrigerant in the old lines
(I assume, since they proposed new newer refrigerant and din't say anything
about running the lines up the side of the house hiding in downspout camo).
Does this sound correct? I understand there's a significant pressure
differnece in the two line sets. Units proposed are Trane and American
Standard, replacing a Ruud system.
Thanks in advance for any good thoughts.