Hap V5.11 _verified_ Jun 2026

is a legacy but capable scripting interface for HEC-HMS v5.1.x, offering powerful automation for hydrologic modeling. It enables batch runs, calibration, sensitivity studies, and custom reporting using Jython. However, for new projects, users should consider migrating to HMS-Py (Python 3) available in HEC-HMS v5.3 and later, which provides modern library support, better performance, and long-term maintainability.

Carrier has stated that (expected late 2025) will address multi-threading and radiant systems. hap v5.11

: Users can model a vast array of equipment, from simple Rooftop Units (RTUs) to complex Variable Refrigerant Flow (VRF) systems and chilled water plants. is a legacy but capable scripting interface for HEC-HMS v5

For projects seeking LEED (Leadership in Energy and Environmental Design) certification, energy modeling is mandatory. HAP v5.11 is designed to generate the documentation required for LEED Minimum Energy Performance credits. It provides detailed Carrier has stated that (expected late 2025) will

If you are a mechanical engineer, energy modeler, or HVAC contractor doing commercial work, is a necessary upgrade—not just a "nice to have." The improved gbXML export, ASHRAE 90.1-2019 baseline tool, and psychrometric chart tracing will save you hours of manual cross-checking.

HAP v5.11 was designed as a maintenance and refinement update to HAP v5.10, ensuring engineers have access to the most accurate data for their simulations.