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Refrigerant Charge Verification Certificate

A Refrigerant Charge Verification Certificate documents a technician’s check of an air conditioning or heat pump system’s refrigerant charge using the manufacturer-specified method — subcooling for TXV/EXV metering devices, superheat for fixed-orifice systems. It records ambient test conditions, pressure and temperature readings, and whether the charge is within the manufacturer’s target range.

Manufacturer charging method (subcooling/superheat), EPA Section 608 technician certificationValid: 12 months

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Sample Charge Verification certificate

Sample Refrigerant Charge Verification Certificate certificate created with CertBox, showing the professional PDF layout with refrigerant type and metering device (txv vs. fixed orifice), ambient dry-bulb/wet-bulb conditions at test, liquid/suction line pressure and temperature readings

Sample Charge Verification with fictional data. All personal details shown are fake.

What it covers

  • Refrigerant type and metering device (TXV vs. fixed orifice)
  • Ambient dry-bulb/wet-bulb conditions at test
  • Liquid/suction line pressure and temperature readings
  • Measured vs. target subcooling or superheat
  • Charge adjustment (added/recovered) and overall result

Who needs a Charge Verification?

HVAC contractors
Homeowners (service calls, pre-sale inspections)
Property managers
Home inspectors

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Professional PDF ready to share via secure link or download.

Frequently asked questions about Charge Verification

Subcooling or superheat — which method should I use?
It depends on the metering device, not preference. Systems with a thermostatic or electronic expansion valve (TXV/EXV) are charged by subcooling; systems with a fixed orifice or piston are charged by superheat. Using the wrong method for the metering device gives an inaccurate charge.
Why do ambient conditions matter for this test?
Target subcooling and superheat values from the manufacturer’s chart are only valid within specific outdoor and indoor temperature ranges. Testing outside those conditions (e.g. a cool morning, or with airflow not yet confirmed adequate) can make a correctly-charged system look wrong, or a mischarged system look fine.

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