On Dec 10, 7:45*am, wrote:
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.

1. Why are you replacing your HVAC? Is the new A/C going to be bigger?
If it is then the refrigerant lines probably need to be of larger
diameter as well and if not you don’t need to replace them.
2. Does your fireplace share the same chimney?