What's involved in converting a Armstrong Ultra Sx 95 upflow 2 stage variable speed furnace to natural gas from propane ? It appears that the unit
was originally a natural gas unit, and was converted to propane. There is a sticker on the side of the furnace with a kit# used to convert it to propane.
Does it involve replacing the heat exchanger or is it more of a valve or gas jet type of thing ? Big deal or small deal...I'm not contemplating doing this myself...just want to be an informed consumer.
Thanks for your knowledge !