A temperature probe for each rack isn't necessarily needed unless your servers are extremely sensitive to heat.
One humidity sensor for the room is good. Does your HVAC system have a Mass Airflow sensor? Sounds like it's a mini tech closet. Does the office have glass break sensors that are tied into the building security?
Really focus on the sensors in the rooms without an AC though. I've seen exhaust fans do a horrible job...
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Christopher S.
System Admin
Online Tech
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