Residential building energy calculator

Describe the building. Get a clear energy-performance result.

A simple commercial workflow for homes: building envelope, ventilation, systems, energy demand, primary energy, CO₂ emissions and an A4 report.

Load demo Start analysis
01

Building

Enter the essential physical data for the heated space.

Building location

Search for a locality or choose a visible point on the Romania map. Climate data is selected automatically.

Loading Romania map...

Building type
02

Building envelope

A simple surface and U-value model. Detailed material assemblies can be added later.

Element Area U-value
External walls
Roof / ceiling
Ground floor
Windows
External doors
03

Ventilation

Simplified airflow through air changes per hour and heat recovery efficiency.

04

Systems

Describe the real generator and the seasonal performance used in the calculation.

Ready to calculate The result uses the simplified monthly model and the declared methodology factors.