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Simple answer is no.
My observatory has lots of natural ventilation and the scopes seem to cool down very easily. I get dew when it gets cold but we mostly have very low humidity so no need for a dehumidifier either. I've never had dew inside the observatory unless the roof is off.
If you are on the coast then I could see the need.
The big observatories certainly keep the scopes cool during the day. They also have a premium on observing time so need to be able to use the scope as soon as it is dark. This is less of a problem with relatively little scopes and more free time.
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