EES Instant Update & Technical Service (IUTS)

Annual updates are provided at no cost for academic institutions. The update must be installed before September 1 in order to avoid problems. Our annual academic update notices have been e-mailed to the contact person. If you have not received your notice please contact us at

Download Latest EES

New non-academic EES licenses include one year of Instant Update and Technical Support (IUTS) service. IUTS service can be renewed.

EES is an unusual program in that it is under continuous development. New versions appear frequently - often daily. The new versions fix bugs in older versions and add new capabilities. With Instant Update Service, users can download a new version from our server whenever they wish to update. The cost for this service is 20% of current cost of the program per year. The update cost is 40% of the current cost for EES versions that have not been updated within the last two years. Users with IUTS are provided with an account name and password to our server from which they can download a new Commercial or Professional version of EES from our website when they wish to do so. Users must have a current subscription to IUTS to receive technical support.

You may order this service online.

The current version of EES on the server is V10.136.


As an EES user, you will likely be interested in the Mastering EES book. This book provides complete and readable information on the use of EES for both new and advanced users.

You may also be interested in the Heat Transfer textbook by G.F. Nellis and S.A. Klein (the author of the EES program) and the Thermodynamics textbook by the same authors. These are the first textbooks to integrate EES and other modern computing tools directly with the application of engineering principles. An extensive heat transfer library for EES was developed in conjunction with the heat transfer textbook and it is included with the Commercial and Professional versions. This library automates the computation of radiation view factors, conduction shape factors, convection heat transfer coefficients, fin efficiencies, and other heat transfer-related information. Both textbooks provide many detailed examples that illustrate how EES can be used to solve realistic heat transfer and thermodynamics problems. Other books that use of EES are listed here .