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Calculates peak heating and cooling loads for residential and small commercial buildings in accordance with ACCA Manual J. Heat Transfer Multipliers (HTM values) for all walls, windows, doors, and roofs listed in Manual J are stored and automatically looked up by the RHVAC program as needed. Although HTM values are taken directly from Manual J, users have the option of entering their own U-Value for each wall, roof, or glass section so that a modified HTM value is used. Design weather data for over 1500 cities is built-in to RHVAC. Users can revise existing weather data and add additional weather data as desired. Zoning CFM adjustments are automatically handled by the RHVAC program as needed. Other outstanding features include exterior glass shading, ventilation air, miscellaneous latent loads, default room data, automatic rotation of the entire building, hydronic heat calculations and much more. Besides calculating peak heating and cooling loads, RHVAC also performs runout and main trunk duct sizing, creates sales proposals and selects HVAC equipment. Duct sizing options include all types of duct materials, height and width restrictions, velocity limits, and more. For equipment selection, RHVAC is provided with a database derived from ARI and GAMA of thousands of equipment models from over 80 HVAC manufacturers. Standard air conditioners, heat pumps, furnaces, boilers, and ground source heat pumps are among the types of equipment RHVAC can select. The sales proposal feature of RHVAC prints key features of the proposed equipment and work to be performed. RHVAC shares data with Elite Software's AUDIT operating cost analysis program, DUCTSIZE, and Quick Quote program. Data can be manually entered into RHVAC or it can be automatically taken from a drawing created with Elite's Drawing Board program. Screen Shots


residential HVAC, residential load calculations, ACCA, Manual J



Expertise Required

Knowledge of residential HVAC practices helpful


Over 10,000 worldwide


HVAC contractors and engineers


Two types of data are requested: general project data and specific room data. The general project data includes the summer and winter design conditions, the outside air requirements, exterior shading and overhang data, the project name, the client name, and the designer name. The room input data includes specific information on the roof, walls, doors, and windows as well as general information on the room name, the number of occupants, and the number of appliances. Help is provided on all inputs. Data sheets are also provided for the easy organization of your information.


The RHVAC program provides numerous presentation quality reports including a title page, general project data, total building and system load summaries, room summary data grouped by zone, detailed room load reports, sales proposal, and numerous color pie charts and bar graphs.

Computer Platform

Windows 9x, NT 4.0, 2000, XP. Pentium class processor, 16MB of RAM, 50MB of hard disk space

Programming Language

Visual Basic


Allows for additional loads not covered in Manual J such as lighting, latent equipment, and ventilation air loads thus making it suitable for some light commercial applications.


More input is required than for load programs that only do a whole house analysis.



Elite Software


P O Box 1194
Bryan, Texas 77806
United States


(800) 648-9523 (979) 846-2340


(979) 846-4367






Contact Elite Software, or visit website for more information. Cost is $495. Free evaluation version available for download from web site.