To be honest with temps like that outside. I dont know what the temps would end up as but this idea just popped into my head...If your running a set-up similar to mine, reverse the ventilation. Have the 435cfm blowing that cold air in and a smaller duct booster for exhaust. If u ran it that way you wouldnt need air cool hoods which does away with the glass which equals more lumens! Even do more lights maybe vertical? But you would have to see if the temps would be right.*Another scenario would be to pull your inlet air from a climate controlled room?
Another thing to look into is coil headed duct boosters. Or heating coils before the tent for inlet.
I would kill for those temps man. Any questions HMU