Most commercial AC units run until they break. This calculator puts a number on that habit, and on what catching failures early saves. Run it for your own building, or for the buildings you service. Every assumption below is editable.
Defaults are a starting point, not a verdict. Benchmarks come from published cost guides; assumptions are our conservative estimates, clearly marked. If you have your own service history, type it in and the results above update instantly.
Your fleet size times the failure rate gives expected failures per year. Each run-to-fail incident costs the emergency repair plus whatever the downtime does to your business that day. The same fault caught early is a scheduled visit at normal rates, with the unit still running. The saving is the difference, applied to the share of failures that give warning signs.
What the calculator deliberately leaves out: energy costs, equipment life extension, and anything else that is hard to prove. If the conservative math already justifies monitoring your equipment, the rest is upside.
Run maintenance contracts? A customer who runs to fail calls whoever answers the phone first. A customer on a monitoring-backed agreement calls you, before the failure, while it is still a scheduled visit. Walk this page through with their numbers, put your company in the Prepared by field, and leave the printout with them. It makes the case for a service agreement on their rooftop units better than a brochure does. See how contractors use Smart HVAC.
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