I don't know of any particularly good commercial designs, but Peltier
effect (thermoelectric) linear controllers are easy to make.  In order to
get more specific, I would need to know the physical constraints (is it a
single cultured cell or a whole animal you are maintaining, etc.) and the
variations that you expect in heat load during your experiments.  I would
guess that there are already good designs in Physiology that you could
copy, but I can send you the one I use if you want it.
 
Katherine Graubard
Dept. of Zoology
University of Washington
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On Wed, 9 Mar 1994, Michael Cammer wrote:
 
> We are considering the purchase of a stage heater/cooler for the Nikon
> Diaphot.  Our main concern is cooling, e.g. stable tempertaure at approx. 22
> degrees C.
> Does anybody have a recommendation of a particularly good stage
> temperature controller.  Right now we have a water cooled system but
> problems include 1.) vibration and 2.) too narrow for access with high
> N.A. objectives.
> Thanks-
> Michael Cammer
>