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May 28, 2014
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eQUEST® v3.65 is a sophisticated, yet easy to use building energy use analysis tool which provides professional-level results with an affordable level of effort.

This freeware tool was designed to allow you to perform detailed analysis of today's state-of-the-art building design technologies using today's most sophisticated building energy use simulation techniques but without requiring extensive experience in the "art" of building performance modeling. This is accomplished by combining a building creation wizard, an energy efficiency measure (EEM) wizard and a graphical results display module with an enhanced DOE-2-derived building energy use simulation program.

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the QUick Energy Simulation Tool

Something for everyone...

Imagine a building energy simulation tool comprehensive enough to be useful to ALL design team members, yet so intuitive ANY design team member could use it, in ANY or ALL design phases, including schematic design. eQUEST is well named because it provides something the you've been looking for, but have been unable to find a sophisticated, yet easy-to-use building energy analysis tool. With eQUEST, you'll be able to provide professional-level results in an affordable level of effort.

Evaluate today's building technologies at the speed of today's design process

eQUEST was designed to allow you to perform detailed analysis of today's state-of-the-art building design technologies using today's most sophisticated building energy use simulation techniques but without requiring extensive experience in the "art" of building performance modeling.

eQUEST = enhanced DOE-2 + Wizards + Graphics

This is accomplished by combining a building creation wizard, an energy efficiency measure (EEM) wizard, and graphical reporting with a simulation "engine" derived from the latest version of DOE-2. Reliable detailed simulation has never been easier!

eQUEST features a building creation "wizard" that walks you through the process of creating an effective building energy model. This involves following a series of steps that help you describe the features of your design that would impact energy use, such as:

  • architectural design
  • HVAC equipment
  • building type and size
  • floor plan layout
  • construction materials
  • area usage and occupancy
  • lighting system

Building Creation Wizard

The eQUEST building creation wizard first requests the most general information about your building design, and then delves into progressively deeper detail. In all, the building description process comprises 23 data-entry steps - each represented by a "wizard" screen.

At each step of describing your building design, the wizard provides easy-to-understand choices of component and system options. It also offers advice in the form of "intelligent defaults" for each choice. (These defaults are based on more information gathered early in the description process). In addition, eQUEST automatically skips steps that do not apply to your design.

Although the building description process can get quite detailed, it isn't necessary to complete every single step in the wizard. If you choose, you can "bail out" of the description process once you are satisfied with the level of detail. At that point, the wizard fills in any missing information using the eQUEST "intelligent default" process.

After compiling a building description, eQUEST produces a detailed simulation of your building, as well as an estimate of how much energy it would use. Although these results are generated quickly, they are quite accurate because this software utilizes the full capabilities of DOE-2 (the latest version of a well-respected and popular building energy simulation program developed over the last 20 years by the U.S. DOE).

Within eQUEST, DOE-2 performs an hourly simulation of your building design for a one-year period. It calculates heating or cooling loads for each hour of the year, based on the factors such as:

  • walls
  • windows
  • glass
  • people
  • plug loads
  • ventilation

DOE-2 also simulates the performance of:

  • fans
  • pumps
  • chillers
  • boilers
  • other energy-consuming devices

During the simulation, DOE-2 also tabulates your building's projected energy use for various end uses such as:

  • lighting
  • plug loads (computers, appliances, copiers, etc.)
  • heating
  • cooling
  • ventilation
  • pumping

Viewing eQUEST Results

eQUEST offers several graphical formats for viewing simulation results. For instance, you can display graphs of estimated overall building energy on an annual or monthly basis. (See Figure 1.) You also can compare the performance of alternative building designs. (See Figure 2.)

In addition, eQUEST allows you to perform multiple simulations and view the alternative results in side-by-side graphics. It offers:

  • Energy cost estimating
  • Daylighting and lighting system control
  • Automatic implementation of common energy efficiency measures (by selecting preferred measures from a list)

The current version of eQUEST provides even more comprehensive analysis capability. It allows the advanced user to input additional building details to analyze complex buildings. A three-dimensional view of the building geometry is available in this version, as well as HVAC system diagrams. In addition, rate schedules for PG&E, SCE, and SDG&E are embedded in the program.

Figure 1: Energy Consumption
(Click for larger image)

Figure 1: A building's projected monthly energy consumption, with consumption attributed to various end-use categories.
Figure 2: Energy Comparison
(Click for larger image)

Figure 2: Comparison of monthly energy use for base building design and four alternatives which incorporate Energy Efficiency Measures (EEMs)


We encourage beginning eQUEST users to read the eQUEST tutorials for a solid background in program fundamentals.

For more information about training options, visit the EDR Upcoming Events page or the eQUEST page.

User Community Support

The best way to get support for eQUEST is to join the equest-users mailing list, where energy professionals from around the globe discuss tips, tricks, and best practices. A companion list, bldg-sim, discusses building energy simulation topics more generally and is not specifically focused on eQUEST.

Please note that Energy Design Resources is not the developer of eQUEST and is not able to provide direct training and support.

eQUEST Documentation

v3.65 Enhancements Only

These documents describe the new features, interface enhancements, and bug fixes included in the latest release of eQUEST:

Full Documentation

Complete documentation for the DOE-2.2 standard version (48r) and the refrigeration version (52h), are contained within the online help installed with this eQUEST release.

Optionally, these dictionaries can be downloaded in PDF format using the links below:

Volume 2: DOE-2.2 BDL Standard Dictionary (complete description of standard version of the DOE 2.2 Building Description Language)

Volume 2: DOE-2.2r BDL Refrigeration Dictionary (complete description of refrigeration version of the DOE 2.2 Building Description Language)

To download older documentation and/or earlier versions of eQUEST, please visit this archive page.

System Requirements and Installation

eQUEST runs on Windows 8/7/Vista/XP, and previous versions of Windows dating back to Win98. eQUEST does not run on Mac OSX, iOS, Android, or other operating systems.

Current Release - eQUEST version 3.65, build 7163, complete (file size 104 MB). This release for Windows 8/7/Vista/XP installs both the standard and refrigeration versions of eQUEST. This release is a Microsoft Installer Package (MSI) file format.

eQUEST v 3.65 Installation - For Windows Administrators

eQUEST must be installed while logged in as the user who will use the program. The installing process must have Administrator permissions to install programs. If the installing user does not have such permissions, a valid administrator name and password are needed to provide the install process with the required permissions. Due to the large file size of the .MSI do not open or run the installation package from within your browser. Instead, download the .MSI file to your hard drive and then execute (double-click) this file from your hard drive. To do this, select 'Save' (after left clicking the link), or right click on the link and then select 'Save Link/Target As'. The wizard will launch and guide you through the remainder of the installation process.

eQUEST v 3.65 Installation - For Non-Administrators

If you are a non-administrator or a MS Windows Home user, you may find these additional instructions helpful:




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 Earlier Comments

by bljones2, Thursday, August 04, 2011 at 7:43:57 PM

Thank you, for this excellent resource. Bryan Jones-BIM Student

by abyssolanrewaju, Tuesday, September 13, 2011 at 3:39:23 AM

Never used it b4,but i hope it works like HAP or Hevacomp

by bhagene, Tuesday, November 15, 2011 at 6:23:37 PM

Is there a way to model a Dedicated Outdoor Air System in EQuest? I saw it has Dual Duct and VAV which are two systems I'm dealing with in my project, but would like to have DOAS.

by mcollar, Wednesday, November 16, 2011 at 10:38:47 AM


by buildwell, Wednesday, November 16, 2011 at 11:18:05 AM

@ bhagene - for modeling DOAS in eQUEST (and other questions) search the archives at:

For example:

by Gehring, Wednesday, December 07, 2011 at 12:23:49 AM


i just downloaded the equest software tool for a first testing, however could not start the exe file due to missing software registration code.
will that be send automaticaly later or can you give me the acess code in return mail?

by tconlon, Wednesday, December 07, 2011 at 12:36:40 AM

When installing eQUEST, normally there is no need to manually enter a registration code – it should be provided in one of the configuration files included in the software distribution. However, sometimes there’s an installation problem that results in the code not being available – Have a look at this post and see if it helps.

If not, we suggest posting directly on the equest-users list .

by yaolei2011, Tuesday, April 10, 2012 at 7:54:22 AM

good,start to learn

by pericoagudelo, Saturday, June 16, 2012 at 3:46:08 PM

Thank for this tool... excellent... We gonna use every day in the unviersity!
Javeriana University
Bogotá, Colombia

by bensauod, Friday, July 06, 2012 at 9:10:47 AM

Thanks a lottttt for this tool... excellent

by andyquest, Wednesday, July 11, 2012 at 4:54:39 PM

Hi, I'm Andrea and I want to know how to load an external library with U-values​​, if the source of this library has an extension *. txt,
Can I have a support email contac? thanks

by DHanson, Sunday, August 26, 2012 at 4:17:49 PM

Hi, I have a Mac that also has an Intel processor. Does anyone know if this will this run equest? Thank you

by DHanson, Sunday, August 26, 2012 at 5:01:59 PM

I was able to open equest using a trial version of crossover! I am on a Mac with an Intel processor. Yay! It can be done, I don't yet know how reliable the operation will be. I'll try to update.

by tdinsc, Friday, December 07, 2012 at 8:53:57 AM

I am trying to determine the energy savings for one (1) Air Handling Unit in a hospital. The economizer on the AHU is not functioning. Is there a way to use eQuest to model just one AHU?

by swilson2175, Friday, January 11, 2013 at 12:37:48 PM

Can someone please explain how the pump power curve ("PUMP-POWER-fFLOW", quadratic equation) affects the pumping energy calculations? Is this curve used to adjust the power consumption based on the design flow conditions (gpm & head) for the varying flow throughout the system? It doesn't match the pump affinity law (ideal power reduction)... is this because the curve accounts for a change/degradation of pump & motor efficiency at the part loads?

by tconlon, Monday, January 14, 2013 at 1:37:13 PM

Have you reviewed the new edition of the Simulation Guidebook? You may find this section useful: "Cautions for Modeling Variable-Speed Pumps and Variable-Chilled Water Flow in eQUEST" (p.51).

If not, we suggest posting directly on the equest-users list.

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