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What to record on a charge check, and why it pays off later

Last updated: October 17, 2026

A charge check is easier to defend, repeat and compare when the readings and the context are written down. This is what is worth keeping.

Why keep a record

A callback, a warranty question or a seasonal return visit all start with the same question: what was it when you left? A short, consistent record of the readings lets you compare visits instead of starting over.

What to record

  • Date, site or customer, and who did the work
  • Equipment make, model and serial number
  • Refrigerant
  • Suction and liquid pressures, with the pressure unit
  • Suction and liquid line temperatures, with the temperature unit
  • The calculated superheat and subcooling
  • Conditions that affect the target, such as indoor wet-bulb and outdoor dry-bulb temperature
  • Notes on airflow, filters and anything you changed

How HVAC Charge Pro fits

With Pro, a calculation can be saved as a job with a job name, site or customer, equipment and notes. You can search your job history and recalculate a saved job with new readings. When you do, choose Update Existing Job to keep a single record, or Save as New Job to keep both visits.

There are two kinds of PDF:

  • From a successful calculation Result: a PDF with the refrigerant, readings and result, without job details. It can be shared within the free allowance of three calculations.
  • From a Saved Job: a PDF report that includes the job details and an optional company name. It requires Pro.

Both are created on your iPhone and shared through the standard iOS share sheet. Saved jobs are stored on your device.

What the app does not store

The calculator takes pressure, line temperature, refrigerant and units. Indoor and outdoor air conditions are not separate fields, so put them in the job notes if you want them on the record.

HVAC Charge Pro and this guide are calculation and reference aids. A superheat or subcooling value alone does not decide whether to add or remove refrigerant. Follow the equipment manufacturer’s instructions, approved service procedures and applicable safety requirements.

Read the Engineering Disclaimer ↗