For electrical, i would make sure to have at least two dedicated circuits. Maybe even three if you have individual HVAC for the fish room.
Mine has 4 circuits, although only two are dedicated.
As far as temp control goes, I try to keep my ambient room temp at 80 and my humidity below 60. I have been able to achieve that with a central AC drop, a portable air conditioner and also a vent fan which at this point is really more to keep reef stench out than to do real heat/rh control. It's much more complicated than people give the problem credit for, unless you just want to through a ton of watts at it and you dont care about heat loss into the room.