ASHRAE 90.1 Baseline Building Verification Checklist

Unlike the Proposed Design, which reflects your specific architectural choices, the Baseline Design is a theoretical reference point strictly defined by code—specifically ASHRAE Standard 90.1 (Section 11 or Appendix G).

At AECO, we utilize a rigorous verification framework to ensure that this fictional reference building is configured correctly. This checklist outlines the critical inputs we validate to guarantee that your energy savings are calculated against a precise, code-compliant standard.

Expert Insight: The Verification Distinction

Proposed Design Checks

Rely on Design Documents. We verify that the model matches the architectural and mechanical drawings of what will actually be built.

Baseline Design Checks

Rely on Code Rules. We verify that the model matches the rules of ASHRAE 90.1. This ensures a standardized yardstick.

Core Verification Areas

I. General Compliance & Model Integrity

Parameter	Verification Task
Model Configuration	Verify approved simulation software, correct Climate Zone, and weather file match Proposed Design.
Unmet Load Hours	Confirm UMLH < 300 hours and match simulation output reports.
Simulation Match	Validate annual energy use/cost outputs align with generated reports.

II. Building Envelope (U-Factors & SHGC)

Parameter	Verification Task
Opaque Surface Properties	Verify U-factors for roofs, walls, floors based on assembly type and climate zone tables.
Fenestration Area (WWR)	Check WWR classification and capping (e.g., 40% for Appendix G) and proportional distribution.
Fenestration Properties	Verify window U-factors and SHGC meet minimum code requirements.
Infiltration & Reflectance	Confirm air leakage rates and roof reflectivity (typ. 0.30) match compliance path rules.

III. Interior Lighting (LPD)

Parameter	Verification Task
LPD Establishment	Verify Lighting Power Density aligns with allowable maximums (Building Area vs Space-by-Space).
Lighting Controls	Ensure NO automatic daylighting/occupancy controls are modeled unless mandatory.

IV. HVAC Systems

Parameter	Verification Task
System Type Selection	Verify System Type (e.g. PSZ-AC, VAV) matches Table G3.1.1A based on building metrics.
Sizing & Capacities	Check sizing runs and mandatory oversizing (15% cooling, 25% heating).
Efficiencies & Airflow	Confirm equipment efficiencies cover minimum standards; airflow based on delta-T.

ASHRAE 90.1 Baseline Building Verification:
A Guide to Model Integrity