HAP System Design Load

HAP System Design Load logo.

Provides the load estimating and system design features found in its popular cousin � Carrier�s Hourly Analysis Program (HAP). By focusing on system design features, the HAP System Design Load program serves as a simpler, more efficient tool for those users only interested in system design; energy simulation features are omitted. Like the HAP program, HAP System Design Load provides the ease of use of a Windows-based graphical user interface and the computing power of modern 32-bit software.
HAP System Design Load uses a system-based approach to HVAC load estimating. This approach tailors sizing procedures and results to the specific type of system being considered. A wide variety of equipment types can be analyzed, including central station air handlers, packaged rooftop units, split systems, fan coils, water source heat pumps and PTACs. System types include CAV, VAV and multiple-zone systems. Sizing data can also be generated for central chilled water, hot water and steam plants. Calculation rigor and integrity are provided by the ASHRAE Transfer Function Method for calculating building heat flow. An extensive list of easy to read reports and graphs document both the basic data needed for equipment sizing and selection, and detailed data needed to investigate building heat flow and system performance. Screen Shots


Cooling and heating load calculation, HVAC equipment sizing, zoning and air distribution



Expertise Required

General knowledge of HVAC engineering principles and MS Windows software applications.


Approx. 5000 worldwide (single & LAN).


Practicing engineers involved in the design, specification and analysis of commercial HVAC systems/equipment. Instructional tool in colleges and universities. Design/build contractors, HVAC contractors, facility engineers, energy service consultants and other professionals involved in the design and analysis of commercial building HVAC systems. Useful for new design, retrofit and energy conservation work.


Building geometry, envelope construction, internal heat gains and their schedules; equipment components, configurations and controls.


design reports provide system sizing information and check figures sufficient to select equipment. Detailed design reports provide information on component loads, load profiles, system performance, psychrometrics and building temperatures. All reports can be exported for use in word processors and spreadsheets.

Computer Platform

Windows 95/98/ME/NT/2000/XP compatible computer, minimum 32 MB RAM, minimum 25 MB hard disk space, display monitor with 800x600 resolution and 256 colors minimum, CD-ROM drive and mouse.

Programming Language

Software is compiled. Source code is not available.


HAP balances ease of use with technical sophistication. The Windows graphical user interface, report features, data management features, on-line help system and printed documentation combine to provide an efficient, easy to use tool.


HAP has limitations for use by research scientists. Because it is designed for the practicing engineer, program features are tailored for this audience. Features such as access to the source code, often necessary in research situations, are not offered.



Carrier Corporation


Bldg TR-4
P.O. Box 4808
Syracuse, New York 13221
United States


+1 (315) 432-6838


+1 (315) 432-6844






In the USA first year license fee for HAP is $795 (single and up to 10 concurrent users per site); annual renewal fee is $159. Special pricing available for educational institutions and multiple site licenses. 45-day money-back guarantee. Current licensees receive all program updates free of charge and unlimited software support via a toll-free support line. Software can be licensed through any Carrier Distribution or Sales Office, or by contacting Carrier using the contact information listed above.