I doubt you will find it efficient enough. The industry has chillers
for aquariums usually with a titanium coil for water contact. These are
conventional refrigeration units with compressors.
I don't know how well they would work in a situation chilling air.
All I could think of using the solid state modules was setting the
terrarium in a tray of water and chilling the water. Seems to me you
only need to cool the lower portion of the terrarrium, slamanders tend
to stay low.