Re: Argument seems illogical
MAE-West (remember that?) suffered a massive outage in the 90s from a power outage where they got the generator running but it didn't provide aircon and it fried most of the equipment in the room from the heat. Rebuilding the equipment in the facility drained most big router vendors spare parts stores for all of the USA.
(the story I heard was there was a gas leak so the fire dept. killed the power to the street, MAE-West ops people dragged the genset outside the exclusion zone, fired it up, got the NAP running again, but in the summer heat in San Jose, CA, the temps in the room quickly exceeded the operational specs for the routers and switches)
You also never EVER want your aircon on UPS, even if you could size the UPS that big. The motor load from the aircon does nasty things to the inverters in the UPS. You need the UPS sized to carry the compute load for the genset spin up time plus the clean shutdown time of the compute load if the genset fails to fire up. The 1.6 megawatt genset at my last job could spin up from complete stop to carrying load in under 5 seconds from the time it was signalled to start (or so the suppliers claimed - I don't think we set the transfer switch that aggressively)