I was wondering what the maximum power draw you have seen. Do you monitor your energy usage during normal use and during a party with all machines buzzing.
I suspect though that even when the game machines are running they probably don't draw all that much power compared to the HVAC. We seem to have ~10-12kW going to HVAC throughout the day... this feels broken to me (these are supposed to be high-efficiency heat pumps and such) but I haven't been able to figure out what's wrong yet.
Whereas if all the computers were drawing the theoretical maximum their PSUs support (750W each) that would be 15kW, but in practice I suspect they draw a small fraction of that most of the time, even when in-game.
In your case I'm surprised that a new build did not have all the heating/cooling aspects calculated. How would you even dimension your HVAC if you don't know the numbers?
There are easy and not so easy solutions:
1. heat recovery ventilation - equalizes the incoming and outgoing ventilation air temperature so you don't have to heat or cool the inside as much but still get a lot of fresh and filtered air.
2. solar shades positioned in a way that shades the sun when it's high i.e. summer time but lets sun in when it's low during the winter.
3. proper insulation and air-tightness .. a hard sell for a house that just came online.
4. ground loop heat-pumps instead of air source.
Other than that I like your house, especially fond of the integrated catwalks/doors!