I set up the cold heat sink in the vivarium with a 5" fan and the hot side
sink on the outside with no fan. Mounted through a 3/8" plywood board for
the top of the vivarium.
Thanks
Karl

wrote in message
oups.com...
The Hagen Life-Glo aperture bulbs direct light well and run cool.

http://www.wetpetsusa.com/haliflaqbu24.html

That will cut down your heat gain a little.

Insulation on five sides will help. With all that area, heat will flow
in.

But where the problem is, I'd say, is the capacity of the heat pump,
and its interface to the terrarium. A big cold plate well greased to
the glass bottom of the aquarium would work, but would cost as much as
a mini-fridge new. If you had a piece lying around, it'd help a lot
because if you just apply the pump to the glass, you'll just get one
cold spot of glass, not much cooling over the area.

But really, such a small heat pump will not cool reliably if your
ambient goes from 59 to 90.

--Doug
No fancy sig available through Google.