SonixOS:
How insulated is your reservoir? It will make a big difference if it's not super insulated. I've seen -38c with mine and it's basically the same as yours, is your evaporator completely submerged that might make a difference (you want it to be completely submerged). Do you have any pictures of your setup,that might help some if you do.
Sorry for not replying for so long, I've been at siggraph.
-Sidney
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