Office AC systems run far longer hours than residential units and are usually the most expensive utility line item after electricity itself.
Recommended cadence: a full inspection and filter clean before summer (March-April), a mid-season check in peak July, and a post-summer service in October to catch wear before winter dormancy.
Offices with 5+ units typically save 15-20% on repair costs annually by moving to a quarterly maintenance contract instead of calling only when a unit fails.
A maintenance contract also means a single point of contact for all units, predictable costs, and priority scheduling during the peak-demand weeks when reactive repair queues are longest.