Release Notes
Welcome to the official Release Notes of the Hysopt product portfolio. This page gives you a concise overview of all updates to the Hysopt product portfolio.
If an update is only applicable to a specific Hysopt product, the update is marked with the corresponding product label (e.g. Simulator-only, Calculator-only ).
All other updates are general software improvements available to all users.
For the Hysopt BIM Syncer, updates marked with 🔄️ require an update of the revit plug-in. This newest revit plug-in can be downloaded here.
Changes Jul 7, 2026
Upgraded the search bar for better element search
Search results are now more transparent, helping users understand why specific elements appear in the result list.
Additional context is shown directly in the search interface, making it easier to distinguish between matches on names, identifiers, labels, and other element properties.
Users can navigate large technical studies more efficiently by quickly identifying the most relevant search result.
This improvement builds on the recent component identifier and component label functionality, making structured model navigation more powerful
Canvas label toggle added to report exports Calculator-only
Added a toggle when exporting component, installation, or pump reports to include or exclude the canvas label column.
This allows users to create cleaner report exports when canvas labels are not used, whilst preserving compatibility with workflows that still rely on the previous canvas label identification logic.
Minor UI updates and bug fixes
Added safety mechanisms to prevent standalone dynamic labels from being copied, avoiding unstable “No label” text objects.
Improved the system check for pump placement around the hybrid production BC “Hydraulic separator with parallel production”.
Changes Jun 23, 2026
Belimo catalogue now available on the ePICV Calculator-only
The Belimo Energy Valve and Belimo EPIV are now available in Hysopt as catalog on the ePICV base circuit.
Hysopt can automatically select the correct Belimo part based on your design requirements
The update allows for much faster Belimo component selection as the selection happens all at once on a model level
BC auxiliaries now scale correctly on floor plans
Improved the scaling behaviour of BC auxiliaries on floor plans, more specifically the lock icon, connector nodes and control connectors.
These BC auxiliaries now correctly scale together with the Base Circuit scaling operation (hotkey: Alt + + and Alt + -).
The update helps avoid visual overlap and improves both model readability and schematic export quality.
Improved pump head calculations with catalogue components Calculator-only
Improved pump head calculations when Hysopt performs a part selection from a manufacturer catalogue.
The pump head calculation now consistently takes into account the properties of the selected part.
Minor changes to existing pump head results may occur when part selection is used with PICVs and ePICVs.
Improved pump head robustness in changeover edge cases
Improved the robustness of pump head calculations in specific changeover edge cases.
The resolved edge case occurs when the critical pressure path is found in one mode, while the critical volume flow rate originates from the other mode.
The calculation now correctly accounts for the mode of each quantity in the pump head calculation.
Changes to existing pump head calculations are not expected, but minor differences may occur in specific edge-case configurations.
Upgraded the Hysopt search user experience
Improved search handling to provide a smoother user experience.
Search now also supports component IDs and component labels.
Added different search types ('search by') for a more tailored search operation
Canvas labels are re-introduced in reports Calculator-only
Re-introduced canvas labels in reports.
The canvas label refers to the regular text label placed closest to a specific BC on the canvas.
This label is linked to the BC in the report through the Canvas label column.
The update ensures backwards compatibility with older technical studies, with canvas labels being complementary to the newer component ID and component label.
Minor UI updates and bug fixes
Resolved system check issue when using an ePICV instead of a PICV at an end units in changeover.
The displayed efficiency of thermal energy source BCs is now correct in all situations, including simulations during which the system was mostly deactivated. Simulator-only
Updated the default Kvs series of 2-way and 3-way control valves to better align with manufacturer series. Minor changes in selected Kvs values may occur. Calculator-only
Updated the ePICV minimum required pressure not reached warning in changeover situations.
Improved the handling of the repetitive BC scaling pop-up dialogue when using Alt++ or Alt+-.
Changes Jun 9, 2026
New BC: passive mixing with ePICV
A new distribution circuit has been added to the heating and cooling library: passive mixing with an ePICV.
This BC extends the available options for modelling pressure-independent control in heating and cooling systems.
New BCs: thermal energy source for cooling and changeover
Two new production unit base circuits have been added to the library: thermal energy source for cooling and for changeover.
These represent generic thermal sources and are suitable for modelling waste energy or district heating/cooling connections.
Both heat consumption and cold consumption are fully integrated in the pareto reporting for a comprehensive energy analysis.
Improved pump calculations and pump reporting for changeover Calculator-only
An inconsistency between the pump head in the application and the pump report export has been resolved, ensuring consistent results.
Support has been added for different Kv-values for heating and cooling valves on all changeover merger base circuits, improving calculation accuracy.
Note: existing changeover models may show minor changes in calculation results following this update.
Minor UI updates and bug fixes
Resolved issue where interaction with deltaT closed the user preferences window unexpectedly on small screens.
Changes May 26, 2026
Added component identifiers and labels for better reporting Calculator-only
Added an identifier and label parameter at component level.
Besides the existing BC identifier, users can now define identifiers and labels for individual components.
Component identifiers and labels are included in report, improving reporting and documentation workflows.
Simulation Quickstart now supports more heat demand methods
Upgraded the Simulation Quickstart wizard with additional heat demand methods.
The wizard now supports zonal models, generic load profiles based on outdoor air temperature and the existing external data upload method.
The new heat demand methods are available across all use cases.
This makes it easier to start simulations from different types of heat demand input.
Upgraded the default model settings in user preferences
Improved the UI and overall user interaction of the default model settings window
Users can now load default model settings from the current model
Users can now also apply the configured default model settings to the current model
Default model settings also got a better placement in the user preferences ribbon
Extended graphs and simulation values of thermal energy source Simulator-only
Extended the integration values and graphs of the thermal energy source for heating.
Heating and cooling end units are now available in reports Calculator-only
Heating and cooling end units (radiators/cooling units/…) are now defined as separate components
As a result, these components are now also available in the component and installation report.
Changes May 12, 2026
Introducing DeltaT: AI inside Hysopt
Added Hysopt DeltaT, the new HVAC Copilot inside Hysopt, giving you instant answers, guidance, and engineering knowledge without leaving your workflow.
DeltaT is built on years of real engineering know-how and insights from 500+ HVAC projects, making its answers practical and relevant to HVAC modelling.
Helps you find information faster, understand modelling choices, and continue working without interrupting their design process.
Launching duct sizing in the ventilation library
Extended the ventilation library with duct sizing design capabities.
The duct sizing algorithm can quickly size complete duct systems based on air velocity or pressure loss constraints.
Added extensive model settings which allows full customisation of the duct catalogue (material types, circular dimensions and rectangular dimensions).
Ducts can also be placed on floor plans, where their lengths are automically calculated
Default model settings are now fully customisable from user preferences 
Added new functionality in the user preferences
Default model settings are automatically applied to all newly created models.
You can configure preferred materials, pipe and duct design rules, unit settings and diversity standards once, and reuse them across future models.
This feature helps standardise your project setup and reduces repetitive configuration work.
New thermal energy source BC for heating
Added a new generic thermal energy source base circuit to the heating library.
The production unit uses heat as its energy source and is fully integrated with pareto reporting.
This base circuit can be used to model heat network connections, waste heat recovery, or other externally supplied thermal energy sources in Hysopt
ePICV upgraded with more guidance and flexibility
Upgraded the electronic pressure independent control valve (ePICV) with better guidance and more modelling freedom.
Added a distinction between the design flow rate and the maximum simulation flow rate to give more control in simulation, while keeping system design consistent
Added extra warning messages when the system design does not provide sufficient pressure across a specific valve instance
Changes Apr 29, 2026
New BC: electronic pressure independent control valve (ePICV)
Introducing the electronic pressure independent control valve (ePICV) for heating, cooling, and changeover applications.
The ePICV combines flow control and dynamic balancing in a single component, using electronic control to maintain a target volume flow rate.
Improved transparency of heat pump design data in the parameter list and dynamic label
Heat pump design data is now displayed more transparently in both the parameter list and dynamic label.
The dynamic label, as well as the condenser and evaporator output parameters, now also take into account locked design conditions.
Tip: Use “Optimise system components” to process new input data and update the parameter list, providing clearer insight into the heat pump’s design capacities.
Changes Apr 15, 2026
DHW tanks upgraded with cold water temperature override Simulator-only
Added a cold water temperature override to all DHW tanks in the Hysopt library
Provides more flexibility in defining boundary conditions for domestic hot water simulations.
Improved design guidance for shunt emission BCs
Added new warning messages to improve guidance when configuring shunt emission base circuits.
The warnings are triggered when gate 2 conditions exceed the propagated conditions to gate 1, indicating that the “full load from gate 3” propagation is not respected.
Minor UI updates and bug fixes
Resolved column misalignment in the component and installation report Calculator-only
Beta IES data upload: Introducing the ability to define the application type of the data. beta release Simulator-only
Changes Apr 1, 2026
Introducing load validation to quick-validate simulated results Simulator-only
Load validation is now available on room controllers and heat flow controlled end units.
The new feature provides instant feedback on the load fulfillment of your simulation.
Any issues are flagged through error/warning messages, along with a new error detection plot that highlights periods with comfort violations.
Load validation allows system defects to be identified early in the project and provides a clear starting point for resolving the unexpected system behaviour.
More information can be found at load validation
New hybrid emission BCs: shunt emission on supply and return
Added two new base circuits to both the heating and cooling libraries.
Shunt emission on supply
Shunt emission on return
These base circuits are particularly useful in combination with ambient exchange for managing excess heat or excess cooling
Upgraded the building simulation quickstart wizard
The Building Simulation Quickstart (BSQ) wizard now opens automatically when creating a new model.
Added a user preference setting to enable or disable automatic opening of the wizard.
Expanded the BC guidance across the Hysopt library
Extended BC guidance to a wider range of base circuits across the library.
The BC guidance brings you instantly to the corresponding wiki page
Improved unit handling of power and energy parameters
Improved decimal input handling for heat flow parameters across all units.
Enhanced the unit behaviour of energy parameters for better consistency and usability.
Minor UI updates and bug fixes
Improved the overall stability of PI controllers Simulator-only
Added a new graph “time at saturation” to all PI controllers to facilitate manual load validation in generic scenarios. Simulator-only
Changes Mar 18, 2026
Upgraded W/W heat pump base circuit
Added a new Design configuration parameter to specify whether the heat pump should be sized using heating or cooling design conditions.
Added additional output parameters to clearly display the heating capacity and cooling capacity of the heat pump at all times.
These improvements make the sizing appraoch and resulting performance of the heat pump more transparent during modelling.
New humid air properties BC variant Simulator-only
Added a new variant of the humid air properties base circuit.
This variant uses dry-bulb temperature and relative humidity as input parameters.
Improved template replacement algorithm
Improved the automatic placement of templates when replacing components.
Added option to insert templates on new canvasses instead on the active canvas
Improved the pre-filtering of energy centre options in the template configuration screen.
More information is available on template configuration window
Added non-return valve BCs in changeover library
Added non-return valve base circuits to the changeover library.
Two variants of the non-return valve are now available in this library under “distribution circuits”
Enhanced Mollier diagram on AHUs
Improved the Mollier diagram and psychometric chart visualisation on all AHUs.
The legend now includes clear numbering for each legend entry
Added the enthalpy axis to the charts
Implemented several minor UI improvements to enhance readability and usability.
Changes Mar 4, 2026
Launching the Building Simulation Quickstart (BSQ) wizard
Introduced the new Building Simulation Quickstart (BSQ) wizard to significantly accelerate model setup.
Enables automatic generation of common header configurations.
Optimised for enabling fast processing of importing building simulation data in Hysopt.
More information can be found at Building Simulation Quickstart
Introducing the template replacement functionality (Ctrl+P)
Auto-insert templates in your system using the new template replacement functionality (Ctrl+P)
The functionality automatically inserts energy centre templates at the location of placeholder BCs
Relevant control connections are made automatically, reducing the need for manual template setup
More information can be found at Template Configuration window (Ctrl+P)
Added energy centre placeholder BCs for early-stage simulations
Added new energy centre placeholder base circuits (BCs).
Intended for use in early project phases when the final production setup is not yet defined.
Placeholder BCs can be easily replaced with actual energy centre concepts using the template replacement functionality.
Enhanced the inspiration library user interactions
Improved user interactions within the Inspiration Library.
Upgraded the filtering interation with instant response
Improved the ‘preview’ option by opening previewed models in new browser tabs
New Base Circuits (BCs)
Non-return valves
Added non-return valve in supply and non-return valve in return under ‘distribution circuits’
Providing these as individual BCs increase modelling flexibility
Added a manual control switch to the control library Simulator-only
Beta Release
Beta features provide early access to functionality that is still under active development. They allow users to explore upcoming capabilities and provide feedback that helps shape future feature releases. Beta features are optional and can be enabled individually via the User Preferences. They are disabled by default to ensure a stable and predictable modelling experience. Note that functionality offered as beta may change or be removed in future releases.
Beta-released features can be found under this section, complemented with the tag beta release.
New Beta release: Solver improvements for faster simulation beta release Simulator-only
Introduced solver performance improvements as a beta feature.
The solver improvements are most noticeable for large simulations
Changes Feb 18, 2026
New Thercon HP Booster (DSW200WQ) now available in catalogue Calculator-only
Added the new DSW200WQ HP Booster to the component catalogue.
The component is available in the Thercon sanistage Base Circuit for DHW applications.
More technical details on this component are available on the website of Thercon.
Improved usability of DHW buffer vessel parameter list
The design heat flow and regime parameters are now bare input parameters for better usability
The update ensures consistent behaviour with the input view option.
Updated freezing point error on pipes Simulator-only
The freezing point error on pipes is now only applicable when using Coolflow DTX.
Changes Feb 4, 2026
Full-year simulations now retain hourly data of all variables Simulator-only
Graph data of all variables are now available after a year simulation
The update allows for more convenient and deeper analysis posibilities of long simulations
The software has been improved fundamentally, increasing simulation performance of complex models
Upgraded the PDF export with a high-resolution option (max DPI)
The PDF export DPI setting now has an option “Max
The max option will automatically provide the user with a high-resolution PDF export
The update allows to download clear Hysopt schematics to share with co-workers.
Enhanced the legend formatting of pipe heatmap exports
The legend of a pipe heatmap export is now properly adapted per page size
Improved the user experience of the PDF export dialogue
The user experience of the PDF export is improved by pre-filtering valid DPI options
The update ensures that users do not trigger an invalid PDF export, causing an instant browser crash
Minor UI updates and bug fixes
The selected energy unit is now taken into account in hover tooltips Simulator-only
The month selector in the simulation start window has been restored Simulator-only
New wiki page on the usage of pipe heatmaps.
Changes Jan 21, 2026
Upgraded the Simulation dashboard Simulator-only
Added a Maximum Recuperation capacity variable to the direct heat recovery analysis
The variable dynamically updates associated graphs and KPIs, improving analysis capability of residual load
The variable is pre-filled with the maximal heat recuperation capacity from the simulation
Added a simulation time indicator to provide context from when the displayed results originate.
Introduced Add to Clipboard on dashboard graphs for easy integration with spreadsheet-like programs.
The design heat flow used for the Equivalent Full Load Hours calculation can now be customised via the dashboard measurement BC.
A new wiki page has been added with a detailed interpretation of the simulation dashboard, which you can consult here