Carrier Hap Software

Carrier Software


How Does It Work?

Carrier’s Hourly Analysis Program is two powerful tools in one package – versatile features for designing HVAC systems for commercial buildings AND powerful energy analysis capabilities for comparing energy consumption and operating costs of design alternatives.

By combining both tools in one package, significant time savings are achieved. Input data and results from system design calculations can be used directly in energy studies.

Who Can Benefit?

HAP is designed for consulting engineers, design/build contractors, HVAC contractors, facility engineers and other professionals involved in the design and analysis of commercial building HVAC systems.

In addition, HAP’s 8760 hour energy analysis capabilities are very useful for green building design. For instance, HAP energy analysis results are accepted by the US Green Building Council for its LEED®1 (Leadership in Energy and Environmental Design) Rating System.

Useful Applications

The program is a powerful tool for designing systems and sizing system components. HAP can easily handle projects involving:

  • Small to large commercial buildings;
  • Systems including rooftops, central air handlers, WSHPs, GSHPs, fan coils, VRF, chilled water and hot water plants and more;
  • Many types of constant volume and VAV system controls;
  • Small office buildings, retail stores, strip shopping centers, schools, churches, restaurants, large office buildings, hotels, malls, hospitals, factories, and multi-use buildings; and
  • New design, retrofit or energy conservation work.


User Interface

HAP uses a graphical user interface to provide quick and efficient access to project data. A modular approach is used to define components of the building and the HVAC systems. This provides maximum flexibility for configuring data to suit a wide range of applications.

System Design


  • HAP uses a system-based approach to design calculations, which tailors sizing procedures and reports to the specific type of system being designed. This offers productivity advantages over simple “load calculation” programs which require the engineer to apply calculation results to size system components.
  • Features are suitable for sizing systems involving central station air handlers, packaged rooftop units, self-contained units, split systems, DX fan coils, hydronic fan coils and water source heat pumps.
  • The program provides features for quickly designing fan coil, WSHP, GSHP and VRF systems in batch runs.
  • Sizing data is provided for central cooling and heating coils, preheat and precool coils, fans, humidifiers, terminal reheat coils, CAV and VAV air terminals, fan powered mixing boxes, perimeter baseboard units, fan coils and terminal heat pumps plus chillers and boilers.
  • HAP calculates required space, zone and system airflow rates. Calculations are tailored to the specific system type.
  • Airflow sizing calculations can be based on design values of supply temperature, CFM or CFM/sqft. Calculations also consider minimum flow specifications in CFM, CFM/sqft, CFM/person which are important for maintaining adequate ventilation and indoor air quality.
  • Space minimum ventilation airflow requirements can be set based on ASHRAE®2 Standard 62-2001 and 62.1-2004/2007/2010/2013, or user-defined values
  • System minimum ventilation airflow requirements can be calculated using the ASHRAE Standard 62-2001, 62.1-2004/2007/2010/2013 calculation procedures, or can be calculated as a simple sum of space ventilation requirements.
  • The ASHRAE Transfer Function Method is used to calculate building heat flow.
  • Key sizing reports summarize data needed for equipment selection in 2 simple pages.
  • Additional reports provide component loads, hourly load profiles, detailed hourly performance data and psychrometric charts.
  • The program is suitable for new construction and retrofit applications.


  • Provides features for copy-and-paste from displayed reports into other documents, and for saving reports as RTF-format documents.
  • Air System Sizing Summary: Sizing data for central cooling and heating coils, supply and return fans.
  • Zone Sizing Summary: Peak loads and airflow rates for all spaces and zones served by the system. Also lists sizing data for zone reheat coils, mixing box fans and supplemental heaters. For DX fan coils, WSHPs and hydronic fan coils this report lists detailed airflow and coil sizing data for all fan coil or WSHP units.
  • Ventilation Sizing Summary: Documents how minimum ventilation airflow rates are calculated. Report has different content depending on whether ASHRAE Std 62-2001/2004/2007/2013 or Sum of Outdoor Airflows was chosen as the calculation method.
  • Design Load Summaries: Three separate reports providing itemized lists of component loads for systems, zones and spaces respectively. Reports can be generated for any hour of any design day during the year.
  • Hourly Load Profiles: Two separate reports providing 24-hour profiles of loads and performance, available in both tabular and graphical formats. The system report lists system airflow rates and coil loads. The zone report lists zone loads, airflow rates, air temperatures and relative humidity. The reports can be generated for any design day during the year.
  • System Psychrometrics: Tabular version of the report provides information about airflow rates, temperatures, humidities and heat flows for each point within the system. Useful for understanding and troubleshooting system operation. Graphical version of the report plots state points on a psychrometric chart. Can be generated for any hour of any design day.
  • Plant Sizing Summaries: Separate reports provide sizing information for chilled water, hot water and steam plants serving one or more air systems.
  • Chiller Load Profiles: Lists 24-hour profiles of loads for a chiller plant serving one or more air systems. Can be generated for any design day and can be graphed.

Energy Analysis


  • HAP performs a true hour-by-hour energy analysis, using measured weather data for all 8,760 hours of the year to calculate building heat transfer and loads, air system operation, and plant equipment operation.
  • Hourly energy consumption by HVAC components (e.g., compressors, fans, pumps, heating elements) and non-HVAC components (e.g., lighting, office equipment, machinery) is tabulated to determine the total building energy use profile as well as daily and monthly totals.
  • Energy consumption data and utility rate information is used to calculate the energy cost for each energy source or fuel type.
  • Because energy analysis reuses input data from the system design work, typically 50% to 75% of the input work needed for an energy analysis is complete once you finish system design


  • Summary reports compare energy use and energy cost of alternate building designs.
  • Detailed reports provide annual, monthly, daily and hourly performance data.
  • Extensive use of graphics allows patterns of equipment performance to be quickly understood.
  • Features provided for copy-and-paste from displayed reports to other documents, and for saving reports as RTF documents.
  • Feature for exporting simulation results in .CSV format makes importing results into spreadsheets simple.
  • Comparative Building Reports: These reports summarize annual component costs and energy use for buildings. Results for as many alternative building designs as desired can be compared side by side on these reports.
  • Summary Building Reports: These reports list annual component costs and energy use for individual buildings, combining graphics with tabular data. Includes energy budget reports.
  • Detailed Building Reports: These reports provide detailed month-by-month cost and energy use data for a building. Many combine graphics and tabular data in a single report. Includes a report documenting the calculation of each utility bill, showing monthly consumption, peak demand and time of peak demand data.
  • Usage Profiles: Presents hourly profiles of electric power or fuel use for any range of days (from1 to 365) selected by the user. This report is available in both tabular and graphical formats. Useful for studying energy use patterns for the building.
  • Monthly Simulation Results: Provides monthly and annual totals of coil loads and energy consumption for individual air systems and plants. Available in tabular and graphical formats.
  • Daily Simulation Results: Provides daily totals of coil loads and energy consumption for individual air systems and plants. Available in tabular and graphical formats.
  • Hourly Simulation Results: Provides hourly coil load and energy performance data for individual air systems and plants. Available in tabular and graphical formats. Users may specify duration from 1 to 365 days in length. Graphical version is especially useful for studying both long and short-term performance trends for equipment.
  • Zone Temperatures: Provides statistical data for air temperature levels in zones served by an air system. Useful for examining comfort levels and also troubleshooting system operating problems.
  • Unmet Loads: Provides summary of hours when equipment capacity is sufficient or is not sufficient to meet loads. Separate reports provided for air systems and plants. Useful when troubleshooting equipment operating problems.

Load Calculation

  • Uses ASHRAE Transfer Function cooling load calculation procedures, ASHRAE design heating load calculation procedures, ASHRAE design weather data, ASHRAE design solar calculation procedures.
  • Calculates space and zone loads 24-hours a day for design days in each of the 12 months. In doing so it calculates heat flow for all room elements such as walls, windows, roofs, skylights, doors, lights, people, electrical equipment, non-electrical equipment, infiltration, floors and partitions considering time of day and time-of-year factors.
  • Performs detailed simulation of air system operation to determine cooling coil loads and heating coil loads and other aspects of system performance 24-hours a day for design days in each of the 12 months.
  • Analyzes plenum loads.
  • Considers any operating schedule for HVAC equipment from 1 hour to 24 hours in duration.
  • Permits hourly and seasonal scheduling of occupancy, internal heat gains, and fan and thermostat operation.

Climate Analysis

  • Provides a database of design weather data for over 800 cities worldwide.
  • Uses TMY, TMY2, TMY3, IWEC, IWEC2, EPW, CWEC, and TRY-type hourly weather data for energy simulations
  • Provides a library of simulation weather data for over 500 cities worldwide.
  • Offers option of importing simulation weather data from external files. Supports EnergyPlus EPW, NOAA TMY3, ASHRAE IWEC2 file formats

Air System Analysis

Performs detailed hour-by-hour simulations of the thermal and mechanical behavior of air handling systems for both system design and energy analysis.


  • Packaged Rooftop Units
  • Self-Contained Units
  • Split DX Air Handling Units
  • Chilled Water Air Handling Units
  • Packaged and Split DX Fan Coils
  • Hydronic Fan Coils
  • Water Source, Ground Source, and Groundwater Source Heat Pumps
  • Variable Refrigerant Flow (VRF)
  • Induction Beams and Active Chilled Beams


  • Single Zone CAV
  • CAV with Terminal Reheat
  • 2-Deck Multizone CAV
  • 3-Deck Multizone CAV
  • Dual Duct CAV
  • 4-Pipe Induction
  • Make-Up Air / Standalone DOAS
  • VAV and VAV with Reheat, Series Fan Powered Mixing Boxes, Parallel Fan Powered Mixing Boxes, or mixed terminals
  • 1-Fan Dual Duct VAV
  • 2-Fan Dual Duct VAV
  • VVT
  • Water Source Heat Pump (WSHP)
  • Ground Source Heat Pump (GSHP)
  • Groundwater Source Heat Pump (GWSHP)
  • 2-Pipe Fan Coil
  • 4-Pipe Fan Coil
  • Packaged DX Fan Coil
  • Split DX Fan Coil
  • Variable Refrigerant Flow (VRF), with and without heat recovery
  • Induction Beams
  • Active Chilled Beams


  • Supply air temperature reset
  • Ventilation airflow control
  • Demand Controlled Ventilation (DCV)
  • Dedicated Outside Air System (DOAS)
  • Outdoor air economizers
  • Ventilation air heat recovery devices
  • Humidistats and humidifiers
  • Preheat and precool coils
  • Perimeter baseboard and fan coil heaters
  • 2-pipe changeover controls

Plant Equipment

Performs detailed hour-by-hour simulations of plant part-load performance.


  • Chiller plants
  • Changeover plants (chilled water and hot water)
  • District chilled water
  • Heat recovery plants 
  • Hot water boiler plants
  • Hot water plants using heat pumps
  • Service hot water (SHW) plants
  • Steam boiler plants
  • District hot water
  • District steam


  • Water-cooled centrifugal
  • Water-cooled rotary screw
  • Water-cooled packaged screw
  • Water-cooled packaged reciprocating
  • Water-cooled packaged scroll
  • Water-cooled single-effect absorption
  • Water-cooled double-effect absorption
  • Water-cooled direct-fired absorption
  • Water-cooled engine chiller
  • Air-cooled packaged screw
  • Air-cooled packaged reciprocating
  • Air-cooled packaged scroll
  • Water-to-water screw reversible chiller
  • Water-to-water scroll reversible chiller
  • Air-to-water scroll reversible chiller
  • Water-to-water screw heat pump
  • Water-to-water scroll heat pump
  • Air-to-water scroll heat pump


Chiller plants can be configured with the following components and controls:

  • Multiple chillers in parallel
  • Three types of sequencing controls
  • Chilled water reset by demand-based reset or outdoor air schedule
  • Chilled water distribution systems including primary-only constant speed, primary-only variable speed and primary/secondary with variable speed secondary
  • Heat Rejection: Cooling Towers, Dry Coolers, Geo/Well Source
  • Cooling tower control by fan cycling, 2-speed fan, variable speed fan or water bypass
  • Waterside Economizer for Water-Cooled Chillers: Integrated, Non-Integrated, Strainer Cycle
  • Waterside Economizer for Air-Cooled Chillers: Integrated, Non-Integrated


Chiller performance data can be defined by:

  • Importing performance data for actual chiller selections from Carrier Electronic Catalog
  • Auto-generating performance data using the “Chiller Template” feature
  • Manually entering data


  • Dedicated heat recovery chiller (DHRC) in parallel with cooling only chillers
  • Air-cooled chiller with heat recovery condenser
  • Heat exchanger in the condenser loop
  • Dedicated heat recovery chiller (DHRC) in the condenser loop
  • Chiller with desuperheater
  • Chiller with double bundle condenser


Hot water can be configured with the following components and controls:

  • Multiple boilers and/or heat pumps in parallel
  • Three types of sequencing control
  • Hot water reset control based on demand or outdoor air temperature schedule.
  • Hot water distribution systems including primary-only constant speed, primary-only variable speed or primary/secondary variable speed secondary.
  • Ability to serve space heating loads only, or combined space heating and service hot water (SHW) loads

Utility Rates

  • Models five common types of electric energy charges.
  • Models demand charges for both electric and fuel rates.
  • Permits seasonal and time-of-day energy and demand pricing to be defined.


  • HAP energy analysis meets the minimum requirements for the Energy Cost Budget compliance path for ASHRAE Standard 90.1.
  • HAP energy analysis results are accepted by the U.S. Green Building Council for use in submissions for the LEED® (Leadership in Energy and Environmental Design) Rating System.
  • HAP has been tested according to procedures in ASHRAE Standard 140-2007, Standard Method of Test of the Evaluation of Building Energy Analysis Computer Programs.
  • Able to import data from gbXML (Green Building Extensible Markup Language) formatted files. This can significantly improve productivity when transferring building data from CAD (Computer Aided Drafting) or BIM (Building Information Modeling) software. Certain CAD and BIM software can export data describing building floorplan geometry and construction information in gbXML Therefore, HAP’s ability to import gbXML files provides a linkage to CAD and BIM software tools.
  • Provides global search and replace features for spaces.
  • Allows the user to efficiently rotate the building orientation.
  • Analyzes external shading from reveals, overhangs, fins.
  • Extensive program help system.
  • Up to 5500 air systems and 32000 spaces, plus unlimited numbers of walls, roofs, windows, doors and schedules per project.
  • Up to 100 zones per air system, up to 50 different spaces per zone, with multipliers allowed.
  • Up to 8 wall constructions, 16 window constructions, 8 door constructions and 16 shade geometries per space.


Program Name
Installer (Licensed Users)
Release Sheet
Download *
Building System Optimizer
Free 90-Day Trial
Download *
Engineering Economic Analysis
Download *
HAP (Hourly Analysis Program)
Free 90-Day Trial
Download *
System Design Load
Download *
Refrigerant Piping Design
Download *
X-Builder Framework
Download **
Download Patch

*Software downloads are for US and Canadian customers only — an access code is required.
**X Builder Framework must be installed prior to installing the other programs.

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