GuzzLabs
EPW|ForgeFeatured Product

(click station to launch)

Custom Forged EPW Files in Seconds

AMY, TMY, CMIP6 morphing, UHI, extreme events — browser or API

OneBuilding
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Subtropical
Temperate
Cool
Polar
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Built forEnergy ModelersMEP EngineersSustainability ConsultantsDevelopersAI Agents
How it works
EPW|Forge

Energy model-ready climate files in three steps

CMIP6-based weather morphing, UHI adjustments, and extreme event modeling on any TMY or AMY.

01
Select Location or Upload
Search 17,000+ stations on the globe, pin a custom location, or upload your own EPW. Pick a station and EPWForge loads all available TMY sources and AMY data back to 1950.
02
Configure Climate Scenarios
Layer future SSP projections (2030–2090), UHI corrections, and extreme event injection onto any basis file. Adjust warming percentiles (P5–P95) and preview changes live on the chart.
03
Download Files Instantly
One-click EPW, DDY, and CSV exports across every scenario — ready for EnergyPlus, IES-VE, and OpenStudio. ASHRAE design conditions computed from full 8760-hour morphed data.
EPW|Forge

EPWForge vs Traditional Weather Workflows

Latest-generation CMIP6 morphing with UHI, extreme events, and 14+ interactive charts — fully automated, browser-based, no scripting required.

Feature
EPWForge
Traditional
Time to generate
Seconds
Hours to days
Manual effort
None — fully automated
Significant scripting & QA
Future scenario capability
Built-in (4 SSPs × 7 bands)
Manual setup required
Climate model generation
CMIP6 (latest)
CMIP6
CMIP6 models in ensemble
19–24 per scenario
~18
Emission scenarios
4 SSPs
3 SSPs
Future time horizons
4 (2030–2090)
3
Warming percentile bands
7 (P5–P95)
3
Physically consistent percentiles
✅
Limited
Temperature morphing
✅
✅
Relative humidity morphing
✅
✅
Diurnal temperature range (alpha) morphing
✅
✅
Solar radiation morphing (GHI/DNI/DHI)
✅
✅
Wind speed morphing
✅
Limited
TMY sources
6 (TMYx, TMY3, CWEC, IWEC+)
1
AMY files (ERA5, any year since 1950)
✅
✗
Urban Heat Island adjustment
✅ Auto-detect (WUDAPT LCZ)
✗
Extreme event injection
✅ Heatwave, cold snap, humidity
✗
Future design day conditions (ASHRAE .ddy)
✅ All scenarios
✗
Per-model ensemble EPW downloads
Up to 24 EPWs
✗
Interactive analysis charts
14+ (psychrometric, wind rose, carpet, etc.)
✗
CSV export with IP unit conversion
✅
✗
Browser-based, no install
✅
✗ (desktop app)
REST API
✅ (OpenAPI 3.1)
✗
AI agent integration
✅ Agent-optimized
✗
Pricing
Subscription-based
Per-model fee
Under the Hood

Built on science. Executed carefully.

CMIP6
Multi-model ensemble
21 climate models across 4 SSP scenarios. All variables at each percentile come from the same physical model — no Frankenstein weather states.
8760
Design days from morphed hourly data
Future ASHRAE design conditions computed as true statistical percentiles of the full morphed year — not simple offsets applied to current values.
Belcher
Morphing methodology
Industry-standard approach with diurnal alpha-factor stretching, physical dew point recalculation, and solar/wind scaling.
ERA5
Reanalysis-backed AMY data
Actual year weather from ECMWF's ERA5 — the best global reanalysis dataset available. Hourly resolution, physically consistent meteorology.
WUDAPT
Urban Heat Island auto-detection
Stations are classified into Local Climate Zones using WUDAPT data. UHI adjustments are automatically applied based on the surrounding built environment — suburban, urban, or dense urban.
GEV
Extreme weather event injection
ERA5 reanalysis fitted with Generalized Extreme Value distributions. Inject heatwaves, cold snaps, and humidity events into any basis file.
Full methodology & citations →

Built by an energy modeling practitioner with 20+ years in the buildings industry.