Make you life easier just heat the room to the correct cool side temp. This is the way 99% of all racks are kept. It is far far easier. I have done the rack in the cool room and my experiences you will need more than two stats as the heat rising causes the top to be dramatically different than the bottom. I use 4 stats on a single rack in a room around 68ºF or so. Two for the hot spots and two for the cool plus two fail safes it means 6 probes. It is far far easier to just heat the room.
radiant heat doesn't heat air well so you may need channels under the heat tape (serpentine are best) to return warm air to the system.
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