15 pounds or more
Covered circuit records are created for circuits at or above the 15 lb full-charge threshold.
Applicability
The 15-pound refrigerant threshold.
The 15 lb threshold is based on the circuit’s full charge, not the amount added during a service event. In Subpart, covered circuit records are created before technician service links are used.
HVACAudit by Subpart helps owners manage Subpart C refrigerant records for covered circuits. Subpart provides accounts, service links, reports, billing, and compliance history.
48-hour service linksOwners send a temporary link to the technician.
No technician accountThe technician can complete the service record without logging in.
Certification numberCertification number and service notes are captured with the record.
Owner historyCompleted records stay connected to the owner’s site, asset, and covered circuit.
Full charge
15 lb full-charge threshold.
The 15 lb full-charge threshold is based on the circuit’s full charge, not the amount added during a service event.
Document full charge
Keep the source for the circuit’s full-charge value clear.
Below 15 pounds
Subpart is built for covered Subpart C circuit records. Circuits below 15 pounds full charge are outside Subpart’s covered-circuit record scope.
Scope
Other scope checks still matter.
Charge size is not the only question. Refrigerant type, GWP, appliance category, and exclusions matter too.
HFC or substitute
Confirm whether the refrigerant falls within the rule’s scope.
Residential/light-commercial exclusion
Do not treat every HVAC service event as covered.
Independent circuits
For equipment with multiple independent circuits, each independent circuit is considered a separate appliance for Subpart C leak-repair purposes.
Technician service links
Owner-controlled records without technician accounts.
Owners create sites, assets, and covered circuit records in Subpart, then create a 48-hour service link for the technician. The technician records refrigerant added, certification number, and service notes without an account. Subpart calculates the leak-rate result from the owner’s equipment history and adds the completed record to the owner’s compliance history.
For owners and facility teams Record control
Keep service work tied to the correct site, asset, and covered circuit.
- ✓Create the equipment record before service work starts.
- ✓Send a 48-hour service link to the technician.
- ✓See whether the link is active, completed, or expired.
- ✓Receive notice when technician service is completed.
For technicians No login required
Open the service link and record the refrigerant service details.
- ✓No technician account is required for service-link completion.
- ✓Certification number is captured with the service record.
- ✓Service notes stay connected to the owner’s equipment history.
FAQ
Common questions
Short answers for coverage, service links, calculation, and account history.
Is the 15-pound threshold based on pounds added?
No. It is based on full charge.
Does the rule cover all HVAC equipment?
No. Residential and light commercial air conditioning and heat pump subsector appliances are excluded.
How should independent circuits be tracked?
For equipment with multiple independent circuits, each independent circuit is considered a separate appliance for Subpart C leak-repair purposes.
References
Primary references
Use current rule text and EPA materials for compliance decisions.
Support
Subpart support
Questions about accounts, billing, service links, or calculator access?