IMO CII and CO2 reporting for vessel HVAC-R systems

The Carbon Intensity Indicator (CII), mandatory under MARPOL Annex VI since 2023, is calculated from a vessel's total annual fuel consumption relative to transport work, not propulsion fuel alone. Auxiliary systems, and HVAC-R and chiller plants in particular, form a continuous background load. Performance drift in that system, such as refrigerant loss, circuit imbalance, or poor chiller sequencing, increases fuel consumption on every voyage of the reporting year, and every extra ton of fuel burned pulls the CII rating the wrong way.

A vessel that receives a D rating for three consecutive years, or an E once, must submit a corrective action plan under SEEMP Part III showing how it will achieve at least a C rating. Continuous, auditable performance data on the largest controllable auxiliary load, HVAC-R, is exactly the kind of evidence that plan needs to be credible instead of merely aspirational.

ClimaWISE does not itself submit IMO DCS or EU MRV filings; that submission remains with the vessel operator, flag administration, or verifier. What ClimaWISE does provide is the underlying evidence, continuously: a real-time and historical API exposes system-level HVAC-R efficiency and drift data that you feed directly into your SEEMP Part II monitoring methodology, MRV monitoring plan, or audit trail for verification, so the reported fuel consumption is no longer an unexplained figure, but one traceable to system performance at any moment.

Yes. ClimaWISE's continuous thermodynamic fingerprint gives fleet managers a consistent, comparable performance record across vessels, instead of one-off surveys. That consistency makes cross-vessel and cross-voyage CII comparisons defensible within a disclosure or a corrective action plan.

Yes, and this is exactly what ClimaWISE was built for. The Energy Efficiency Existing Ship Index (EEXI, from 400 GT, applying to MARPOL Annex VI chapter 4 vessels engaged in trade) already covers virtually every commercially operated or chartered yacht from roughly 45 metres up. The Carbon Intensity Indicator (CII, from 5,000 GT) covers the largest charter tonnage and every cruise vessel. This pattern holds at every size above that: a larger vessel runs a larger, continuous HVAC-R and chiller load, meaning a larger share of annual fuel consumption, meaning a larger CII/EEXI impact, and a larger opportunity to improve the rating with better data.

Yes. Refrigerant leakage from HVAC-R and provision cooling systems is a direct emissions source, tracked separately from CO2 under the F-Gas and MARPOL frameworks. ClimaWISE detects charge loss at a 3% deviation, versus 50%+ with traditional monitoring methods, giving crews and fleet managers an early, quantifiable figure instead of discovering the leak after most of the charge is gone.

Chief engineers use it to prioritise maintenance before an issue affects performance or fuel consumption. Fleet managers and DPAs use that same continuous record to compare vessels, support CII corrective action plans, and report consistent, measured figures instead of relying on periodic manual surveys.