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N=The nominal amount of cooling/heating units required in a building. The +1 refers to an addition HVAC unit as a redundant backup to all others.

Example: A calculation is performed to decide the amount in tons that a building requires. The result is 12 tons. To achieve this the owner does not want to use one 12-ton unit, but rather three 4-ton units or four 3-ton units. The N+1 requirement would give the building contractor the option to put four 3-ton units or five 4-ton units to provide a redundant unit.

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Q: What does N plus 1 HVAC mean?
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