| Are results certified? | No — they're engineering estimates from catalog data and published correlations. Catalog entries marked "EN 12900" use manufacturer-published data, unverified by the manufacturer unless claimed. |
| Units? | SI or US customary, yours to choose: °C, kPa, kW, m³/s, kg/s and l/h, or °F, psi, MBH, cfm, gpm and gal/h. The app asks on a first visit and the switch stays in the top bar; the reports print in either, and so do the public chart, lookup and catalog pages (?units=us). A design is stored the same way whichever you read it in, and the API speaks SI. |
| Languages? | English, Deutsch, Français, Español, Italiano, Polski, Nederlands, Svenska, Norsk, Suomi, 中文, 日本語 — picker in the top bar. |
| Billing? | Prices in USD (see pricing); checkout can present your local currency. Cancel anytime; your saved systems are kept on downgrade. |
| Refrigerants? | All CoolProp fluids including zeotropic blends (R448A-class); validated curve-fit fallback for R410A. |