I certainaly recommend warmer rooms for racks. I however seem to be the odd one out and run a rack in a cool room it is rarely over 76ºF and rarely under 66ºF. It can be done but it is a crazy amount of work to get there and lots of controls to keep it. I have warm and cool side heaters T-stats to control warm and cool top and bottom (4 probes for the rack) and lots of insulation and careful air flow vents to keep the cool room air out of the rack and to use preheated air. It can be done but it isn't the easy or cheap route. (ok it is a lot cheaper for me as the room is poorly insulated)
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