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For an SCT, they just about need a dewshield in a vacuum! (I have a C925)
Even with one they will eventually dew up on many nights of the year, the corrector plate is quite thin and radiated heat off into the air quite quickly. With my C925 I ended up with a dewshield, a heater and an eyepiece heater, with that lot it was good all night all year round. The eyepiece heater is not as important, but in colder weather, one errant breath when things have cooled right off can see your eyepiece fogged in an instant.
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