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Carrier’s Hourly Analysis Program (HAP) 6.31 is a commercial HVAC building-load calculation and energy-modeling package developed for consulting engineers, design/build contractors, HVAC contractors, and facility engineers who need to size mechanical equipment and predict annual energy performance. The application performs detailed 8,760-hour simulations that translate weather data, internal gains, and system control sequences into peak heating/cooling loads, airflow requirements, and utility cost estimates, letting designers compare multiple plant configurations before construction. Typical use cases include central-plant sizing for office towers, chiller-and-boiler retrofit studies, LEED energy-cost budgets, and utility-incentive documentation; the same project file can generate both design-day load reports and EnergyPlus-compatible schedules for code-compliance submissions. Because the program couples equipment libraries for chillers, boilers, rooftop units, and VAV terminals with tariffs from more than 3,000 North-American utilities, engineers can calibrate models against measured demand and fine-tune control strategies to reduce kWh and peak kW. Version 6.31 introduces ASHRAE 90.1-2019 baseline automation, expanded refrigerant options for R-32 and R-454B, and 64-bit solvers that cut annual simulation run-times on large mixed-use buildings by up to 40%. Earlier releases—versions 4.91 and 5.11—remain available to support legacy projects governed by older efficiency standards. HAP is classified as HVAC engineering software and integrates with Carrier’s system selection tools, allowing seamless export of coil capacities and airflow rates to its equipment configurators. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g., winget), always delivering the latest version, and supporting batch installation of multiple applications.
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