Tool / AIM Act leak repair

Refrigerant leak rate calculator

For HFC appliances with a full charge of 15 lb or more. Run it each time you add refrigerant, then print the result for your records.

Not covered by this rule: residential and light commercial air-conditioning systems, and appliances that contain only an ozone-depleting refrigerant. New to the rule? Read what it requires.

Appliance

Type

Full charge, lb

Equipment ID / location (for the printout)

Refrigerant (for the printout)

Service visit

Method

Use one method for every appliance at a facility.

Refrigerant added, lb

Pounds added at this service visit.

Days since last addition

For your first calculation after January 1, 2026, the rule says to use 365.

Date added

Sets the repair deadline if the rate is over the trigger.

Technician (for the printout)

Leak rate record40 CFR 84.106

Enter the appliance and service details, then calculate. The result and repair deadline appear here.

Repair triggers

Appliance type	Trigger
Comfort cooling	10%
Refrigerated transport and other	10%
Commercial refrigeration	20%
Industrial process refrigeration	30%

Repairs and verification are due within 30 days of the addition (120 days if an industrial process shutdown is needed).

How it's calculated

Annualizing

(added ÷ full charge) × (365 ÷ days) × 100

Rolling 12-month

(added in last 12 months ÷ full charge) × 100

Days are capped at 365. See the full calculation guide and the repair timeline. Source: 40 CFR 84.106. Summarized from EPA guidance and last checked 2026-10-02. This tool is informational and is not legal advice.