left on the HTML for a NG

Look, can't even reply to a NG correctly. You're messing around with the
HTML.

I stand by my suggestion look into new direct vent furnace, OP said it
was the ONLY thing vented into the chimney.

New furnace can pay for itself and is a INVESTMENT in the home.Energy
prices just go up over time/

This is all fine and dandy, but I'd hate to see what recommendations you
give if someone was asking about paint. You'd say something like buy new
cabinets.

You're information is not fitted for the problem at hand. I'm afraid this
thread is over your head.