Hi Josh, welcome to IIS!
I opened a thread a while ago about dew control for my solid-tube GSO dob and was told to avoid heaters because as soon as heat comes into play, thermal air currents form in the OTA and a warm "boundary layer" of warmer-than-ambient air forms around the primary and both can degrade the quality of what you're seeing. Its important to keep your scope as close to the ambient air temperature as possible, but to keep the air moving in order to prevent dew build-up. I was directed to this article and found it very helpful;
http://www.iceinspace.com.au/63-400-0-0-1-0.html
I've since made a plate out of thin plywood for the rear of the OTA with a cut-out for the collimation screws and the fan and attached it with Velcro, doing this along with the internal baffle described there has virtually eliminated all dew problems I was having.
I'm not sure if it will work with the secondary on your scope though because the open truss/collapsible tube may prevent the air current from reaching the secondary, but I think it should at least keep the primary from dewing up whilst preventing any warm air currents caused by heaters from affecting your seeing (again, not that you should have any air-current problems with your truss design).
Possibly the article fix along with a dew shield and shroud may be enough to get the air moving inside your scope and keep the dew off your mirrors whilst staying at the ambient temperature and limiting thermals.
Davin
