i would have running water to that room. small exhause fan in one corner of sealing. your really going to need that zone A/C, maybe a small unit just that room. sounds great that your going to build a house with a tank [ large tank] in mind. i would go bigger if i were you. you only get one shot if it's in the wall.
350 gal. 7\'x36\'\'x25\'\'tall, , 3-400w.mh-10k, 2-6\' vho actinic, 175gal.sump, 6ft. 100gal zenia fuge,calcium reactor, kalk reactor and a carbon reactor. 7\' turbofloter 5000 skimmer.