HE + Carbon.
The easiest way to justify the Spanish CTE DB-HE with market-grade precision.
Upload your IFC, DXF or DWG — or draw the floor plans right here — and get simulated energy demand, HE0/HE1 verification and the building's embodied carbon in a single report.
What you get
kWh/m²·yr
HE0 · HE1
kg CO₂e
Official CTE
Why «with precision»
Calibrated against the case published by the Ministry.
Not an estimate with coefficients: the engine is EnergyPlus and it uses the official CTE weather files. These are the comparison figures as they are, not rounded in our favour.
| Metric | HULC | Descarboniza | Δ |
|---|---|---|---|
| K — global heat transfer | 0,55 W/m²K | 0,533 W/m²K | −3% |
| Cooling demand | 30,17 kWh/m²·año | 31,19 kWh/m²·año | +3,4% |
| Heating demand | 9,19 kWh/m²·año | 7,22 kWh/m²·año | −21,4% |
| Combined demand | 39,36 kWh/m²·año | 38,41 kWh/m²·año | −2,4% |
Heating diverges by 21% in relative terms, but that is −2 kWh/m²·yr on a very small base: known dispersion between different engines when demand is low.
Before simulating
The site's climate, first.
Every envelope decision starts with understanding where you are. The bioclimatic study reads 8,760 hourly records for the location —temperature, radiation, wind, humidity— and turns them into concrete passive strategies before you draw anything. It is the natural precursor to the calculation, and it is included.
Generate a bioclimatic studyWhat this is not
This tool does not replace official verification. For filing and approval, HULC remains the Ministry's reference tool. What we do is get you there having already made the good decisions, with carbon on the table from day one instead of as an annex at the end.
It's in beta and part of the Professional plan.