Installing new furnace
how much would just replacing the furnace cost me in terms of installation cost, if I had already changed the black pipes to the system 636 white pipes. Since i replaced my water htr to change the pipe we had to cut open the ceiling, so im thinking of changing the black furnace pipes too.
I notice some rusting on the clamp at the end of the pipe near the vent. Installer says cld have caused by condensation. Any advice on shld i change the pipe now or leave for later say a yr or 2.