Surely the first thing you do when asked to move a large number of systems is talk to the facilities group to make sure that adequate power & cooling is available. Before plugging things in.
At one of my contracts I happened to get 'floor manager' as one of my duties, as that position had been empty for a good while despite being rather urgently needed: a reorg would see about 80 racks worth of systems move into our computer room.
That was more than just a bit ambitions, as even after Much Reshuffling of the kit present, and redoing several access aisles, there was room for a mere 55 racks. But with respect to power and cooling, all was supposed to be fine even after the last box would have been moved in and powered up, as both power and cooling were at about 15% load initially and were calculated to go up to about 35% of maximum capacity. Apparently, someone had opted for Massive Overkill on the design specs and managed to get them signed off.
And indeed, those post-move figures were close to correct, and even showed we had been somewhat zealous about rounding up. So, just when things had settled again after the move, there was a power failure and the no-break dutifully kicked in.
Still no problem. Really.
Until ten or so minutes later sensors in the UPS shed started calling out severely elevated temperatures. This was saved by Site Facilities through the use of all the floor-standing fans they could find, pointed at the opened doors of the UPS shed.
Lessons Learned: yes, the UPS shed's cooling system should also be running off the no-break power.