At 09:16 PM 10/25/99 -0400, you wrote:
>
>That sounds good, but what about dirt?  Is that an issue here?  If it
>is, the only reliable way I can think of doing this is to have two
>temperature sensors and a hygrometer:
>
>   1 temperature sensor monitoring ambient temperature
>   1 hygrometer measuring humidity
>   1 temperature sensor monitoring the glass surface temperature
>
>If the temperature of the glass gets close to the dew point, then
>kick the heater/fan on.
>

I know there must be some reason you can't do this or somebody would have
said it already...

Why not just leave the fan/heater on all the time?

Or at worst cycle it to lengthen the life...

-Erik Reikes