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HVAC Maintenance Dates and Runtime Planner

Calculate service dates from documented intervals or compare actual runtime readings with a service threshold, then save and export the record.

Use this result well

Inputs that matter
Review date (YYYY-MM-DD), Maintenance tasks and intervals, Sources and assumptions, Meter observation date (YYYY-MM-DD), and 4 more
Output to expect
Maintenance date schedule, Maintenance runtime threshold
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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HVAC

Reference & details

How it works

Maintenance date schedule

Calculate next dates from the actual maintenance intervals selected for your equipment and documented conditions. Enter the last completed date, calendar-day interval and a review date. The tool schedules your plan; it does not infer filter life, prescribe annual refrigerant service or send notifications.

Next date = last completed date + specified calendar days; days until due = next date − review date.

Maintenance runtime threshold

Compare an actual cumulative runtime meter with the reading at the last service and a documented service interval. An optional projected date uses your explicit future daily runtime assumption, which is separate from observed meter readings.

Next meter reading = last-service reading + interval; remaining hours = next reading − current reading; projected days = ceil(positive remaining hours ÷ assumed daily hours).

Updated: September 2026

Example Scenarios

The built-in example is an arithmetic illustration. Replace it with your own verified measurements or planning assumptions.

→ 1 task due by 2026-09-09

The built-in example is an arithmetic illustration. Replace it with your own verified measurements or planning assumptions.

→ 200 runtime hours remaining

FAQ

No. Use the manufacturer’s instructions and condition assessment. Calendar schedules start from actual completion dates; runtime projections depend on a consistent meter and your future usage assumption.

Use the actual source documents, units and operating conditions shown in the selected mode. Replace illustrative examples with your records, enter explicit zeros only where valid and retain unresolved assumptions.

Choose Save planning case for local history. Copy MD retains current inputs, notes and interpretation; Download CSV exports the result breakdown. Export a separate copy before changing devices or clearing browser storage.

About HVAC Maintenance Dates and Runtime Planner

Calculate next dates from the actual maintenance intervals selected for your equipment and documented conditions. Enter the last completed date, calendar-day interval and a review date. The tool schedules your plan; it does not infer filter life, prescribe annual refrigerant service or send notifications. Compare an actual cumulative runtime meter with the reading at the last service and a documented service interval. An optional projected date uses your explicit future daily runtime assumption, which is separate from observed meter readings.