No trouble . You should use a glycol or propanol anti-freeze made for your application as it's different than auto anti-freeze.
Dow Chemical makes the two types. Dowtherm and Dowfrost. there are probably others.
I should have learned to play the g'tar on the MTV. MK
As with any coil,, keep it clean. They basically capture energy that was going out with the return air and bring it back to the fresh air with the use of Glycol and pumps. Heat recovery is getting more important all the time as I am sure you know.