Climate & Run
Select a city or upload an EPW file, set your inputs, then run the 8,760-hour simulation.
Building & Envelope
Internal Gains & Outdoor Air
HVAC Systems
Advanced / Passive Design
General
Envelope & glazing by orientation
| Surface | Gross area (ft²) | Opaque U (Btu/hr·ft²·°F) |
Glazing area (ft²) | Glazing U | Glazing SHGC | % shaded |
|---|
Opaque heat rate per surface = (gross − glazing) × U. Slab-on-grade floor uses F-factor × perimeter. Roof slope/azimuth from above; walls assume vertical (90°).
Setpoints & schedule
Internal gains (defaults from building use; override as needed)
Outdoor air
System selection
Delivered energy = hourly load ÷ COP (heating fuel applied to heating, electricity to cooling/lights/plug). EUI in kBtu/ft²·yr.
Passive cooling & ventilation
Night-flush thermal mass & passive solar
Passive-solar savings use the Balcomb load-collector-ratio (LCR) method; night-flush uses a lumped thermal-mass charge/discharge model on the design week.
Results —
Hourly net zone load across the year (heating below 0, cooling above)
HeatingCooling
Monthly heating & cooling energy (MMBtu)
Peak load component breakdown (Btu/hr)
Design-day load profiles
Peak heating dayPeak cooling day