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Before getting too carried away with heaters try the simple solutions first.
The fan blowing onto the back of the mirror combined with a shroud should take care of most of the dew problems on both the primary and the secondary. If you still have problems then the addition of a dew/light shield should fix the problem completely except on the worst of nights that, thankfully, are very rare in your warmer climate.
Heaters introduce other problems we spend lots of time avoiding and should only really be used when all else fails.
Cheers
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