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Max,
I use a DewBuster system with a series of Kendrick Firefly dew heater straps. Works a treat.
On my FSQ-106N, I have one on the dew shield, and one on the focuser drawtube to try and maintain temperature equilibrium. I also have one on the finderscope. The DewBuster system accepts two temperature sensors (you really ony need one, though, as I can't imagine there being such a huge temperature difference within the space of 1 metre square).
Check out the Dewbuster web site. It mightn't be the cheapest solution at $200, but, it has alleviated the need to keep taking a hairdryer to the optics, as well as running a dew strap 100% all the time. I set the temperature i wish for the strap to reach above ambient (typically between 5-10 degrees) and forget about it for the rest of the night. It takes care of everything.
H
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