FTIDOE is an up-to-date, unbiased simulation program that provides one of the most comprehensive set of tools for performing the complex process of dynamic energy analysis. This software enables architects and engineers to perform a comprehensive analysis of dynamic heating and cooling loads, simulation of heating and cooling distribution systems, modeling of equipment supplying the required energy, and calculation of the life-cycle costs of owning and operating energy systems for buildings. The program can simulate hour-by-hour performance for buildings ranging in size from a small one room residence to a large multi-storied structure for each of the 8760 hours in a year.

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FTIDOE is a commercial version of the DOE-2 software developed at Lawrence Berkeley National Laboratory in conjuction with the Department of Energy and other organizations.  FTIDOE's computational engine is 100% compatible with the DOE-2 engine.

FTIDOE consists of a Graphical User Interface (GUI) and a computational engine.

The GUI for FTIDOE proivides an environment for users to manage projects, compile weather data, develop simulation models and process the modules through the computational engine.  FTIDOE supports Windows, Linux and Solaris operating systems with identical features and look, feel and features across all platforms.  Depending on the hardware capabilities of your computing system is is possible to run multiple simulations while editing or building a seperate model.

 The computational engine is where the real work is acomplished.  The engine provides a number of components;  the Building Description Language (BDL) preprocessor, the Loads module, HVAC module, Economics module, Weather data compiler and materials library.  These modules combine to create the computational engine the computes the results of the structure described in the model input file.

The accuracy of the FTIDOE/DOE-2 is has been validated by numerous studies in many countries.  Because it is scientifically rigorous and the source code is open to inspection, DOE-2 has been chosen to develop state, national, federal, and international building energy efficiency standards, including:

• The ASHRAE-90.1 standard for commercial buildings, which is based on thousands of DOE-2 analyses for different building types and climates. The standard is mandatory for new federal buildings, and has been adopted by many states for non-federal buildings.
• The ASHRAE-90.2 standard for residential buildings, which is based on 10,000 DOE-2 analyses.
• The State of California standard for commercial buildings (Title 24).
• Standards for other countries, such as Hong Kong, Saudi Arabia, Kuwait, Singapore, Malaysia, Philippines, Indonesia, Thailand, Switzerland, Brazil, Canada, Mexico and Australia.

DOE-2 is the basis of books and design guides on energy-efficient buildings. These include:

• Small Office Building Design Handbook
• Skylight Design Handbook
• Foundation Handbook
• Energy and Economics: Strategies for Office Building Design Atrium Handbook
• PWC Daylighting Manual and Microcomputer Spreadsheet.