Fast HVAC load calculations for multi-zone buildings.
Build multi-zone projects, enter envelope and ventilation data, and get transparent heating & cooling load results with formulas you can verify.
Built for engineers
A focused, premium calculation tool
Designed for HVAC, mechanical and energy engineers who need quick, defensible peak-load estimates.
Calculation transparency
Every result shows its formula, inputs and intermediate values, so you can verify or improve the calculation.
Multi-zone support
Add unlimited zones, copy zones, use templates for common rooms and aggregate to a project total.
Report export
Generate a clean PDF report with project info, climate, zone inputs, full results table and load-breakdown charts.
Features
- Multi-zone buildings
- Transparent formulas
- Local-first storage
- PDF report export
- Light + dark mode
- Works offline as PWA
Load Master uses transparent simplified engineering load calculation based on public heat-transfer and psychrometric formulas. It is not a certified regulatory calculation method.