I have to install a new furnace (oil) with an A-Coil for Cooling. Due to height requirments I am putting in a low boy that is 37" tall. Again, due to existing duct work issues, I would like to place the coil on the return side of the unit (negative pressure). The unit is a Concord. My supply house tells me this is not recommended and may cause corrosion of the heat exchanger. I was wondering if anyone had experience with this our thoughts?
Thanks
Roy