Racks are heated with heat tape or in some cases heat rope. Most professionally made racks will include this heat tape. lamps cannot be used with a rack system.
racks require a temperature controlled room. It needs to be heated/ cooled so it stays between 75-85 F year round. (+/- a few degrees)
A single thermostat can only control a single heat source, or multiple heat sources that are identical in every way
For example you can hook up 3 24" inch long pieces of 4 inch wide heat tape to a single thermostat because they all will produce very similar amounts of heat.
You cannot hook up 2 different heat sources, for example a UTH and a heat lamp. because of the vastly different power requirements of the 2 heat sources the thermostat cannot control them both at the same time. To do this there are multichannel thermostats like the herpstat 4. The herpstat 4 is literally 4 thermostats in a single box. it has 4 probes, 4 outlets, and 4 programable channels.
This is very different from a herpstat 1 which only has 1 probe/outlet/channel:
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