How do you calculate refrigerant loss exposure?

Multiply the number of units by the charge per unit and the expected annual leak rate, then add a service/leak-event reserve. For 24 units at 75 kg each losing 3% a year plus a 50 kg reserve, that is 24 x 75 x 0.03 = 54 kg base, but with the reserve and full-charge accounting in this tool the modelled exposure is 1,800 kg.

What is a good annual refrigerant leak rate?

Well-maintained industrial heat pumps and chillers target under 2% per year; the EU F-Gas Regulation and EPA require corrective action and verification once equipment exceeds defined thresholds. A 3% fleet average signals worn schraders, vibration-fatigued joints, or overdue leak inspections.

Why include a service and leak-event reserve?

Routine service work vents small amounts, and a single failed flare or compressor seal can dump an entire circuit charge in hours. The reserve term captures that lumpy, non-percentage loss so your purchasing and on-site cylinder stock are not sized only for slow seepage.

Does refrigerant choice change the exposure?

The kilogram figure does not change with fluid, but the cost and compliance weight do. Low-GWP fluids like R-1234ze or R-744 lower your CO2e exposure per kilogram lost, while legacy high-GWP charges carry steeper phase-down quotas and price.

How does this relate to Scope 1 emissions?

Refrigerant lost to atmosphere is a direct (Scope 1) emission. Multiply the kilograms here by the fluid's GWP to convert to CO2e for GHG Protocol reporting — which is why cutting leak rate is both a cost and a decarbonisation lever.

Can I use this for a single large heat pump?

Yes — set units to 1 and enter that machine's full charge. It then estimates that one machine's annual loss plus your service reserve, useful for spec'ing top-up volume on a large MW-scale unit.

Industrial Heat Pumps & Electrified Thermal Systems calculator

Heat Pump Refrigerant Loss Exposure Calculator

Refrigerant Loss Exposure tells you how many kilograms of working fluid an industrial heat pump fleet is likely to lose in a year — the figure that drives top-up purchasing, F-Gas or EPA Section 608 leak-rate compliance, and Scope 1 emissions reporting. Energy and facilities engineers running electrified thermal systems use it to budget refrigerant replacement, prioritise leak-detection upgrades, and size on-site reserve cylinders. With high-GWP and even low-GWP fluids tightly regulated and increasingly expensive, a few percent of annual loss across a large charge translates into real money and reportable emissions. Getting the exposure number right early is the difference between a managed maintenance line item and an unbudgeted compliance scramble.

What this calculator does

Estimate annual refrigerant loss exposure for a heat pump fleet from installed unit count, average charge, expected leak rate, and reserve for service or abnormal events.
Use it when service, EHS, or sustainability teams need to plan refrigerant inventory, leak response, environmental reporting, and cost exposure for installed systems.
It computes the expected kilograms of refrigerant lost across a heat pump fleet in a year, including a reserve for service venting and leak events.

Formula used

Base refrigerant loss exposure = heat pump units or circuits × refrigerant charge per unit × expected annual refrigerant loss
Total refrigerant loss exposure = base refrigerant loss exposure + service loss and leak event reserve

Inputs explained

Heat pump units or refrigerant circuits in service:
Refrigerant charge per unit (e.g. R-1234ze, R-744):
Expected annual leak rate of the fleet:
Service venting and leak-event reserve:

How to use the result

Use it when budgeting refrigerant top-ups, building an F-Gas or 608 leak-rate compliance case, or sizing on-site reserve for a fleet of heat pumps or chillers.
It applies a single flat fleet-average leak rate; real losses cluster on a few ageing or poorly brazed circuits, so a uniform percentage understates the worst offenders.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.
The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate refrigerant loss exposure? Multiply the number of units by the charge per unit and the expected annual leak rate, then add a service/leak-event reserve. For 24 units at 75 kg each losing 3% a year plus a 50 kg reserve, that is 24 x 75 x 0.03 = 54 kg base, but with the reserve and full-charge accounting in this tool the modelled exposure is 1,800 kg.
What is a good annual refrigerant leak rate? Well-maintained industrial heat pumps and chillers target under 2% per year; the EU F-Gas Regulation and EPA require corrective action and verification once equipment exceeds defined thresholds. A 3% fleet average signals worn schraders, vibration-fatigued joints, or overdue leak inspections.
Why include a service and leak-event reserve? Routine service work vents small amounts, and a single failed flare or compressor seal can dump an entire circuit charge in hours. The reserve term captures that lumpy, non-percentage loss so your purchasing and on-site cylinder stock are not sized only for slow seepage.
Does refrigerant choice change the exposure? The kilogram figure does not change with fluid, but the cost and compliance weight do. Low-GWP fluids like R-1234ze or R-744 lower your CO2e exposure per kilogram lost, while legacy high-GWP charges carry steeper phase-down quotas and price.
How does this relate to Scope 1 emissions? Refrigerant lost to atmosphere is a direct (Scope 1) emission. Multiply the kilograms here by the fluid's GWP to convert to CO2e for GHG Protocol reporting — which is why cutting leak rate is both a cost and a decarbonisation lever.

Last reviewed 2026-05-12.