I have a WaterFurnace AT070. It's approximately 17 years old (not sure exact date, we bought the home 1.5 years ago and the WaterFurnace was already installed). We've been seeing low-pressure faults for a couple weeks now. The tech diagnosed it as a leak in the air coil (ours is the old-style, without the corrosion-resistant coating they put on them now). We can replace the air coil (with a new coil that does have the corrosion-resistant coating) for about $$$$ or replace the whole furnace for about $$$$. Obviously I'd like to avoid the $$$$ hit right now, but is it foolish to put $$$$ into a 17-year-old furnace?
The tech seemed to think our furnace might be nearing it's end of life? I know they replaced the flow pump in 2009 and I think the compressor has been replaced once but I need to double-check that and I don't have a date. Anyway I"m looking for advice on whether to replace or repair? Thanks!