CHVAC logo.

Quickly and accurately calculates the maximum heating and cooling loads for commercial buildings. CHVAC allows an unlimited number of zones which can be grouped into as many as 100 air handling systems. CHVAC automatically looks up all CLTD cooling load and correction factors necessary for computing loads. In addition, the programs can look up outdoor design weather data for over 1500 cities located around the world. There is also provision for editing the weather data as well as adding data for other cities. Comprehensive reports list the general project data, detailed zone loads, air handler summary loads, outside air loads, total building loads, building envelope analysis, tonnage requirements, CFM air quantities, chilled water flow rates (if applicable), and complete psychrometric data with entering and leaving coil conditions. Other outstanding features include ASHRAE Standard 62 analysis, automatic building rotation, 360 degree wall orientations, tilted glass, exterior shading, internal operating load profiles, variable indoor design temperatures, people diversity, pretreated outside air, seasonal infiltration and ventilation rates, reheat loads, duct gains and losses, and return air plenums. CHVAC project data files can also be used by Elite Software's EZDOE energy analysis program.� Input data can be entered manually or it can be automatically taken from drawings made with Elite's Drawing Board program. Screen Shots


commercial hvac, load calculations, CLTD



Expertise Required

General hvac background


6000 worldwide


HVAC Design Professionals


Five types of data are requested: general project data, outdoor design data, building material data, air handler data, and specific zone data. The general project data includes the project and client name, designer, building opening and closing hours, internal operating load schedules, and any desired safety factors. The outdoor design data includes the summer and winter outdoor design conditions (automatically looked up for you if a city reference is given) and the desired ventilation and infiltration rates. The building material data includes the definition of master building material types for roofs, walls, partitions, glass sections, and exterior shading. A user defined material library is available for saving the data on common material types. The air handler data includes the fan and terminal type, the desired heating and cooling supply air temperatures and data for duct heat gains and losses. The zone data includes the zone name, floor length and width, number of people, equipment watts, lighting watts, external shading data, and specific roof, wall, partition, floor, and glass data.


CHVAC� provides eleven types of reports which can be selectively previewed on screen or printed as desired. CHVAC supports all Windows printers�and numerous� color reports are available. The reports include: General Project Data, Air Handler Input Data, Zone Input Data, Detailed Project Zone Loads, Air System Zone Summary, Total Building, Air System, and Zone Load Profiles, Air System Total Load Summary, Air System Psychrometric Analysis, Overall Building Envelope Report, Pie Charts, Bar Graphs, and the Total Building Load Summary. Air system summary data can be exported to your favorite spread sheet.

Computer Platform

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

Programming Language

Visual Basic


Extensive built-in help. All results can be easily manually verified. Proven results since 1980.


Requires additional data input when a CHVAC project file is exported to EZDOE.



Elite Software


P O Draw 1194
Bryan, Texas 77806
United States


+1 (800) 648-9523 +1 (979) 846-2340


+1 (979) 846-4367




Contact Elite Software, or visit website for more information.� Cost dependant upon desired number of zones. Free evaluation version available for download from web site.