Provenance
Every parameter has a source
Data comes from manufacturer catalogues, the EPREL database and Eurovent certification. For each value we keep the origin, measurement conditions and update date — verifiable.
Methodology · version 1.2
How we calculate — and how we know.
Every number in Datklima has an origin, measurement conditions and a date. We show the method, not just the result.
Design temperature
Climate computed from data, not guessed
We derive climate zones and design temperature from the ERA5 reanalysis for the location. Heat pumps are computed on the W35/W55 heating curves, with a bivalent point and capacity at the normative temperature (e.g. −7 °C).
Certification
Eurovent, EPREL, KEYMARK
We tie performance and energy classes to official registries: EPREL (EU energy labels), Eurovent (performance certification) and KEYMARK. When a manufacturer doesn't publish a value, we say so plainly — we don't guess.
Versioning
The method has a version history
The methodology is versioned (currently 1.2). We record assumption changes with a date, so a selection from a month ago can be reproduced. Auditability is a requirement, not an add-on.