Please read before you buy or install. This agreement limits the Licensor's liability (Sections 11 and 12), makes you responsible for checking all results (Section 9), sets the tested scope and known limitations of EnergyFront by reference to its Validation Documents (Section 9.5) and asks you to indemnify the Licensor (Section 13). By clicking "I accept" during purchase or installation, or by installing, activating or using the Software, you accept it. If you accept on behalf of an organisation, you confirm that you may bind it.
1.1 "Licensor" means the individual who owns and operates the business trading as "ArchOpt Technologies". ArchOpt Technologies is a trade name, not a registered company. The Licensor's legal name appears on your invoice and is given on request. Contact: architecture.optimization@gmail.com
1.2 "Software" means the program you obtain under this agreement: EnergyFront, PareVia or EPCalibration, in any version, including updates, example files and documentation.
1.3 "Results" means any model, IDF file, tagged file, schedule, script, chart, table, calibrated parameter, optimised design, report or other output that you produce with the Software.
1.4 "Validation Documents" means the Validation and Testing Report of EnergyFront and the public validation package that accompanies it, for the version of EnergyFront concerned. For EnergyFront V3.5 these are the "EnergyFront V3.5 Validation and Testing Report" (October 2026) and the "EnergyFront V3.5 Public Validation Package", available in the program (Help > Validation and testing report) and at archopt-technologies.github.io/Validation
2.1 The Software is licensed, not sold. The Licensor keeps all rights, title and intellectual property in the Software. You receive only the rights stated in this agreement.
2.2 Each licence key gives you a personal, non-exclusive, non-transferable, revocable right to install and use one product on ONE computer, for the subscription period you paid for, for your own professional, research or teaching work.
2.3 A key is activated online and bound to that computer by a machine identifier. If you replace the computer, contact the Licensor, who may move the licence once it is deactivated on the old computer.
3.1 Licences are sold for the period stated at purchase, for example one month, one year or a multi-year term. Monthly and yearly plans are subscriptions handled by the payment provider: they renew at the end of each period at the price shown at purchase until you cancel them with the provider. Cancelling stops future payments; the period already paid stays active until it ends. Introductory prices apply only for the period stated on the website.
3.2 The Software checks the licence with the Licensor's licence server. It may work without an internet connection for a limited period (at most 7 days), then needs a connection to start. When the period ends without renewal, the Software stops starting. Your files stay on your computer and remain yours.
3.3 Academic and student licences, offered at a reduced price to students and staff of accredited universities and research institutes, may be used only for teaching and non-commercial research, never for paid work. The Licensor may ask for proof of academic or student status and cancel a licence that does not qualify.
3.4 Trial, evaluation, beta and free versions, and any feature marked "beta" or "experimental", are provided for testing only, AS IS, and Sections 10 to 12 apply to them with a liability cap of zero.
4.1 Fees are paid in advance for the whole subscription period, through the payment provider shown on the website. The Licensor does not receive or store your card details.
4.2 Fees are non-refundable, in whole or in part, including for unused time or features, except as set out in Section 12.5 or where a refund is required by law that cannot be excluded by agreement.
4.3 You are responsible for any taxes, duties and bank charges in your country.
4.4 If a payment is reversed or charged back, the licence may be deactivated until the amount is paid.
4.5 Prices and offers may change for future periods. A change does not affect a period already paid.
You may not, and may not allow anyone else to:
6.1 Your input files and your Results belong to you. The Licensor claims no rights in them.
6.2 If you send suggestions or bug reports, the Licensor may use them freely to improve the Software, without obligation to you.
You are solely responsible for:
8.1 The Software contains open-source components of other authors, listed with their licences in THIRD-PARTY-LICENSES.txt in the program folder; the GNU licence texts are in the LICENSES folder.
8.2 Those components are licensed to you under their own licences, not under this agreement. Nothing in this agreement limits the rights those licences give you, including the right under the GNU Lesser General Public License to replace the Qt for Python (PySide6) libraries and other LGPL libraries with modified versions and to reverse-engineer the Software to the extent needed to debug such modifications.
8.3 To the extent permitted by those licences, Sections 10 to 12 also apply to the third-party components as delivered with the Software.
9.1 The Software is an engineering and research decision-support tool. Results are estimates produced by numerical models. They depend on your inputs, assumptions, weather data, EnergyPlus and the methods used, and may differ materially from real building performance, energy use, cost, carbon, comfort or overheating.
9.2 The Software and its Results are not professional engineering, architectural, legal or financial advice. The Licensor is not your consultant, designer, engineer of record or adviser, and owes you no professional duty of care through the Software.
9.3 You must have all Results reviewed and verified by a suitably qualified professional before relying on them for any design, specification, construction, procurement, investment, certification or compliance decision. You remain fully responsible for those decisions and for work you deliver to your own clients.
9.4 The Licensor does not represent that the Software or its Results satisfy any building code, energy regulation, rating system or standard (for example Estidama, LEED, BREEAM, ASHRAE 90.1, ASHRAE 140, ASHRAE Guideline 14 or EN 16798), or that they will be accepted by any authority, assessor or client. Any validation or comparison results published by the Licensor describe only the stated version, test cases and conditions. They are information, not a warranty that the Results for your buildings are accurate.
9.5 Validation Documents of EnergyFront. EnergyFront has been tested by the Licensor as described in its Validation Documents, including comparative tests that follow the method of test of ANSI/ASHRAE Standard 140-2020 (building envelope cases 600 to 650 and 900 to 950 and the free-floating cases), HVAC BESTEST and Furnace BESTEST cases, and example files of EnergyPlus 9.4. By accepting this agreement you confirm that you have been given the opportunity to read the Validation Documents, and you agree that:
No Validation Documents are published for PareVia or EPCalibration. Their Results are subject to Sections 9.1 to 9.4 and 9.6.
9.6 The Software is not designed for, and you must not use it for, the real-time control or monitoring of real buildings, HVAC equipment or safety systems, or any use in which a failure could cause death, personal injury, or physical or environmental damage. Control scripts and EnergyPlus API features are for simulation only.
TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE, THE RESULTS, THE LICENCE SERVER AND ANY SUPPORT ARE PROVIDED "AS IS" AND "AS AVAILABLE", WITH ALL FAULTS AND WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS OF RESULTS, COMPATIBILITY WITH ANY ENERGYPLUS VERSION OR OTHER SOFTWARE, UNINTERRUPTED OR ERROR-FREE OPERATION, AND NON-INFRINGEMENT. NO ADVICE OR INFORMATION, ORAL OR WRITTEN, CREATES ANY WARRANTY NOT STATED HERE.
TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE LICENSOR IS NOT LIABLE, IN CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF STATUTORY DUTY OR OTHERWISE, FOR:
EVEN IF THE LICENSOR WAS ADVISED THAT SUCH LOSS WAS POSSIBLE.
12.1 TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE LICENSOR'S TOTAL AGGREGATE LIABILITY FOR ALL CLAIMS ARISING FROM OR CONNECTED WITH THIS AGREEMENT, THE SOFTWARE OR THE RESULTS SHALL NOT EXCEED THE FEES YOU ACTUALLY PAID FOR THE LICENCE CONCERNED IN THE 12 MONTHS BEFORE THE EVENT GIVING RISE TO THE FIRST CLAIM. FOR TRIAL, BETA AND FREE USE THE CAP IS ZERO.
12.2 TO THE EXTENT PERMITTED BY LAW, ANY CLAIM MUST BE NOTIFIED TO THE LICENSOR IN WRITING, AND ANY PROCEEDINGS STARTED, WITHIN ONE (1) YEAR AFTER THE EARLIER OF: (A) FOR A CLAIM ABOUT RESULTS, THE DATE ON WHICH THE RESULTS CONCERNED WERE PRODUCED BY THE SOFTWARE (THE DATE OF THE SIMULATION, OPTIMISATION OR CALIBRATION RUN); AND (B) THE DATE YOU BECAME AWARE, OR SHOULD REASONABLY HAVE BECOME AWARE, OF THE FACTS GIVING RISE TO IT. AFTER THAT PERIOD THE CLAIM IS WAIVED, AND NO CLAIM OF ANY KIND CAN BE MADE ABOUT THOSE RESULTS. WITH THE NOTICE YOU PROVIDE THE PROJECT FILE, THE INPUT FILES (FOR EXAMPLE THE IDF), THE WEATHER FILE, THE RESULTS CONCERNED AND THE VERSION OF THE SOFTWARE USED. RESULTS ARE EXAMINED ONLY FOR THE VERSION THAT PRODUCED THEM.
12.3 Before starting proceedings, you agree to notify the Licensor of the problem in writing and to allow 30 days to fix it or resolve the matter amicably.
12.4 These limits reflect the price of the licence. The fees would be substantially higher without them. Each exclusion and limit is separate and applies even if another is held unenforceable or a remedy fails of its essential purpose.
12.5 SOLE REMEDY FOR RESULTS. IF, WITHIN THE PERIOD OF SECTION 12.2, RESULTS ARE SHOWN TO BE WRONG BECAUSE OF A DEFECT OF THE SOFTWARE, YOUR ONLY REMEDIES ARE, AT THE LICENSOR'S CHOICE: (A) CORRECTION OF THE DEFECT IN AN UPDATE OF THE SOFTWARE; OR (B) REFUND OF THE FEE YOU PAID FOR THE LICENCE PERIOD UNDER WHICH THE RESULTS WERE PRODUCED. TO THE MAXIMUM EXTENT PERMITTED BY LAW, NO OTHER COMPENSATION OF ANY KIND CAN BE CLAIMED ABOUT THE ACCURACY OF RESULTS.
12.6 Nothing in this agreement excludes or limits liability that cannot be excluded or limited by applicable law, such as liability for fraud or for death or personal injury caused by negligence.
You will defend, indemnify and hold harmless the Licensor against all claims, losses, damages, liabilities, penalties, costs and expenses (including reasonable legal fees) brought by any third party, including your clients, employers, partners and authorities, that arise from:
The Licensor will tell you promptly of any such claim and may take part in its defence with its own counsel.
14.1 To check the licence, the Software sends to the licence server the licence key, the product name and version, and a machine identifier (a code derived from the computer, such as its hardware or its Windows installation identifier, used only to bind the licence to that computer). The server also sees the internet address of each request, as any web server does. The website and payment provider process your name, e-mail address and billing details to sell and deliver the licence.
14.2 This data is used only to sell, issue, check, support and manage licences, and to prevent misuse. It is not sold. It may be stored with hosting providers outside your country.
14.3 The Software does not send your projects, models, Results or files to the Licensor.
14.4 You may ask about this data, or ask for its deletion after your licence has ended, at the address in Section 17.9, subject to records the Licensor must keep by law.
You confirm that you are not located in, ordinarily resident in, or acting for a person or entity in a country or territory subject to comprehensive sanctions, and that you are not named on any applicable sanctions list. You will not export or use the Software in breach of export-control or sanctions laws that apply to you or to the Licensor. The Licensor may refuse or cancel a licence where it reasonably believes this section is breached.
16.1 This agreement ends automatically, without notice, if you breach Sections 3.3, 4.4, 5 or 15, or otherwise materially breach it. The Licensor may then deactivate the licence key without refund.
16.2 The Licensor may suspend a licence key while investigating suspected fraud, misuse or sharing.
16.3 When the agreement ends you must stop using the Software, uninstall it and destroy all copies.
16.4 Sections 4.2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16.4 and 17 survive termination.
17.1 Updates and support. During a paid period the Licensor may provide updates and reasonable support by e-mail, but is not obliged to. The Licensor may change, replace or discontinue features, products or the licence server in later versions.
17.2 Changes. The Licensor may update this agreement for new versions and renewals. The version you accepted applies to the period already paid for; renewal or installation of a new version means acceptance of the version then shown.
17.3 Assignment. You may not assign or transfer this agreement or a licence without the Licensor's written consent. The Licensor may assign this agreement, including to a company that it establishes or controls, or to a buyer of its business, by notice on the website or by e-mail.
17.4 Force majeure. The Licensor is not liable for any delay or failure caused by events outside its reasonable control, including internet, hosting or payment-provider failures.
17.5 Severability. If a provision is held invalid or unenforceable, it is modified to the minimum extent needed to make it enforceable, and the rest of the agreement remains in force.
17.6 No waiver. A failure or delay in enforcing a right is not a waiver of it.
17.7 Independent parties. Nothing in this agreement creates a partnership, agency, employment or joint venture.
17.8 Entire agreement. This agreement, with your order or invoice and the parts of the Validation Documents referred to in Section 9.5(c), is the entire agreement about the Software and replaces any earlier statements, including on the website. If it is translated, the English version prevails.
17.9 Notices. Notices to the Licensor must be sent by e-mail to architecture.optimization@gmail.com. Notices to you may be sent to the e-mail address used for your purchase.
17.10 Governing law and courts. This agreement and any dispute arising
from it are governed by the laws of the Emirate of Dubai and the federal laws of the United Arab Emirates. The courts of Dubai have exclusive jurisdiction. The United Nations Convention on Contracts for the International Sale of Goods does not apply.
17.11 Mandatory rights. The Software is sold worldwide. Nothing in this
agreement excludes or limits rights that the law of your country gives you and that cannot be excluded or limited by agreement; each limit in this agreement applies to the extent that law allows.
Copyright © 2026 ArchOpt Technologies. All rights reserved. EnergyFront, PareVia and EPCalibration are product names of ArchOpt Technologies. EnergyPlus is a trademark of the US Department of Energy; the Software is not affiliated with, sponsored by or endorsed by the US Department of Energy, NREL or the EnergyPlus developers. The same agreement is shown by the installer of each program and is installed as EULA.txt in the program folder.