Hi All,
There's a product that's been around for years in the piano technician's
field to help in climate control for pianos. It's maufactured by
Dampp-Chaser Mfg Co. and is a metal rod which is available in different
lengths and from 8 to 50 watts. Their web page will answer most
questions and includes an item on closet dehumidifiers.
http://www.dampp-chaser.com/html/closet_benefits.html

They distribute world wide primarily through piano techs.
I use two 15 watt short models in the "closet " which houses my
computer in the observatory. The closet is double walled and insulated
with the styrofoam type insulation and a vapour barrier. This works well
in this situation. I particularly like not having an open light bulb as
a heat source, just seems a bit safer. I use a min-max
thermometer-hygrometer to see what it is doing. A potentially wet (as
in outside) location wouldn't be any good for using these.
They make a humidistat that turns the bar on when the humidity rises
above about 48% but they don't recommend it in this type of use.
For really cold weather I use a small heating pad set low under the
shelf that supports the computer. The scope seems alright uncovered. The
roof design has a 1 1/2" space between the roof and the top plate on the
full extent of the eave sides and there have never been any problems
with condensation or drying after a dewy night's run.

Regards,
Eric

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