EPA 608 Refrigerant Leak Rate Calculator
Calculate your annualized leak rate to ensure EPA compliance.
The total amount of refrigerant in the system when full.
Refrigerant added to return system to full charge.
Number of days elapsed since the last refrigerant addition.
Comfort Cooling (10% Threshold)
Commercial Refrigeration (20% Threshold)
Industrial Process Refrigeration (30% Threshold)
Annualized Leak Rate
0.00%
Pounds Lost Per Year (Projected)
0.00 lbs
Result pending…
Understanding Refrigerant Leak Rate Calculations
Under Section 608 of the Clean Air Act, the EPA requires owners and operators of refrigeration and air conditioning equipment with refrigerant charges of 50 pounds or greater to calculate the leak rate every time refrigerant is added. If the leak rate exceeds the allowable threshold, mandatory repairs must be performed within 30 days.
The Annualizing Method Formula
This calculator uses the EPA's Annualizing Method, which projects the future leak rate based on the current addition. This is the standard formula used when servicing equipment:
Leak Rate (%) = ( Pounds Added / Total System Charge ) x ( 365 / Days Since Last Addition ) x 100
Input Parameters Explained
- Total System Charge: The total weight of refrigerant (in pounds) the system holds when operating normally at full capacity. This is usually found on the equipment nameplate.
- Amount Added: The exact weight of refrigerant added to the system to return it to a full charge.
- Days Since Last Addition: The number of days between the current date (when gas is being added) and the last time refrigerant was added.
EPA Trigger Rates (Thresholds)
Depending on the classification of your HVACR equipment, the trigger rates for mandatory leak repair vary:
- Comfort Cooling: 10% (e.g., Office building chillers, residential-style AC in commercial settings).
- Commercial Refrigeration: 20% (e.g., Supermarket cases, cold storage).
- Industrial Process Refrigeration: 30% (e.g., Manufacturing cooling, chemical processing).
Example Calculation
Imagine a Comfort Cooling chiller with a 1,000 lb total charge. A technician finds it low and adds 20 lbs of refrigerant. The last time refrigerant was added was 60 days ago.
Calculation: (20 / 1000) x (365 / 60) x 100 = 12.16%.
Since 12.16% is greater than the 10% threshold for Comfort Cooling, the owner must repair the leak within 30 days and perform initial and follow-up verification tests.