Going through the quote process for my new furnace and AC and came up
with two questions:

1 - Are new refrigerant lines required or recommended? The existing
system is 26 years old, still working
no burned out compressor, etc. One company says they have to be
replaced, other I didn't talk with
on that specific subject, but their quote calls out flushing and re-
using the existing ones.

2 - The new furnace will be direct vent, so it leaves the gas water
heater orphaned on the existing chimney that was shared with the gas
furnace. Is a chimney liner required or recommended? Chimney is
clay flue lined, most of chimney is entirely within the house, except
the last 5 ft or so which is in a wood siding chase above the roof
line. Don't have the exact measurements of the flue without going on
the roof, but guessing it's about 9 X 6 or so. Again, one company
says must do, the other says not needed.