Instrument and chemicals that are available in my lab are (1) refrigerated circulating liquid (-30 degrees), (2) ethylene glycol, (3) distilled water, and (4) coiled circulating pipes.
I wonder could you try a pump immersed in liquid nitrogen and us mixed liquids as homo-thermal agent.
Methanol/Liquid nitrogen -98
Diethyl ether/Dry ice -100
n-Propyl iodide/Liquid nitrogen -101
n-Butyl iodide/Liquid nitrogen -103
Cyclohexane/Liquid nitrogen -104
Isooctane/Liquid nitrogen -107
Ethyl iodide/Liquid nitrogen -109
Carbon disulfide/Liquid nitrogen -110
Butyl bromide/Liquid nitrogen -112
Ethyl bromide/Liquid nitrogen -119
You could use a partially frozen solution of ethanol in acetone, with 0.135 mol/mol for the molar fraction of ethanol, which freezing point should match 173 K.
Reference:
S. Sapgir, "VII. Application de l'analyse thermique à des mélanges binaires de composés organiques fondant à tres basse temperature", Bull. Soc. Chim. Belg., 38 (1929) 392-408; http://www.ddbst.com/en/EED/SLE/SLE%20Acetone%3BEthanol.php
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