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For Houston I would get the largest golden rod that will fit and at least an e-500 Evadry.

I have both in mine in my garage in DFW and they are fine. The Evadry is in the upper half and the golden rod is on the bottom. I don't remember how may cubic feet my safe is, but it claims to hold either 36 or 48 guns.

I would also recommend some kind of wireless sensor to be able to monitor the temp and humidity without having to open it up. Since the sensor will be inside a big metal box the range won't be great, but it should reach several feet. My safe is next up against an exterior wall and the interior wall to the inside of the house where the pantry is. That's where I have the base monitor where I can see the vitals inside the safe without having to even go into the garage.