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[Hammersquash]

  I cracked open my plenum today to install my heating coil and much to my chagrin there is no room for it under the A coil.

  I have a Brunswick forced air Oil furnace and the A Coil only has about 2" above the peak of the 'A' so I can't raise it to install the water coil. 

  Is it a viable solution to install the water exchanger on the cold air return side? 

[MerrellRoofing]

That's what I had to do. I had the same issue.

[dukethebeagle]

mine is to.does a good job

[Dano]

Mine is in the return after the filter no problems.

[AirForcePOL]

Mine is also on the return side.  Just make sure you put a filter before the coil and you won't have any issues. 

[Hammersquash]

  Thank you very much to those who responded with the same issue I have.  I ended up making a tight install with a new filter bracket above coil.  I am very happy with the results and it was easier than lifting the house 5" to allow enough room to raise A coil.

A- Coil.  Not a great pic, but inlet side is restricted and there is no room to raise it as I have a 1880 farmhouse with low basement.

https://www.flickr.com/photos/123605823@N05/15011026098/

Pic of coil installed, pre soldering.

https://www.flickr.com/photos/123605823@N05/15174542986/

Another, before filter install.  (don't mind the dirty filters, they are gone now!)

https://www.flickr.com/photos/123605823@N05/15010783399/

Now installed.  Tight fit with new filters.

https://www.flickr.com/photos/123605823@N05/15010996027/

Buttoned up!

https://www.flickr.com/photos/123605823@N05/15010782569/

[AirForcePOL]

Looks good!!