HVAC Design Software That Predicts Real-World Performance
Design, simulate and validate hydronic HVAC systems in one connected engineering workflow—reducing oversizing, eliminating rework and proving performance before construction.
Trusted by leading HVAC engineering teams
Engineering consultancies, contractors, developers, utilities and building owners use Hysopt to reduce project risk, eliminate engineering rework and prove HVAC performance before construction.
Used on 550+ HVAC projects • Commercial, healthcare, data centres, education, industrial & district energy • Trusted across Europe, North America & the Middle East
DESIGNED FOR HVAC ENGINEERS, CONSULTANTS & TECHNICAL TEAMS
Built for the people responsible for HVAC performance
Whether you're evaluating concepts, designing systems, coordinating BIM models or commissioning equipment, Hysopt provides the engineering foundation to make performance-driven HVAC decisions.
MEP Consultants
Compare HVAC concepts faster, defend recommendations and win more projects.
HVAC Engineers
Reduce rework, eliminate oversizing and validate designs with confidence.
Design & Build Contractors
Reduce technical uncertainty, avoid costly redesigns and minimise installation surprises.
Technical Directors
Standardise engineering quality, reduce rework and improve project profitability.
Decarbonisation Teams
Compare low-carbon concepts and justify decisions with CAPEX, OPEX and CO₂ analysis.
WHERE HYSOPT FITS IN THE HVAC PROJECT LIFECYCLE
One digital twin from feasibility to operation
Every HVAC project follows the same engineering lifecycle—but most teams use disconnected tools at every stage. Hysopt keeps one physics-based hydronic HVAC digital twin connected from feasibility through operation, so every decision builds on the last.
Choose the right HVAC concept before committing to detailed design
When time is short and project information is limited, the wrong concept can lock in unnecessary CAPEX, operating costs and CO₂ for years. Hysopt lets you rapidly generate, compare and evaluate HVAC concepts so you can select the best solution with confidence.
You'll be able to:
• Compare multiple HVAC concepts in hours instead of weeks
• Evaluate CAPEX, OPEX and CO₂ consistently
• Support tenders with transparent engineering evidence
Digital twin advantage
The same digital twin created during feasibility becomes the engineering foundation for every phase that follows. Nothing is recreated later.
Explore better designs before they become expensive to change.
Most engineering teams compare only a few options because every alternative means rebuilding calculations. Hysopt lets you explore, compare and refine multiple hydronic system concepts while every calculation stays connected.
You'll be able to:
• Compare more design alternatives with less effort
• Optimise hydraulic concepts before detailed engineering
• Reduce oversizing before it enters the project
Digital twin advantage
Every concept remains part of the same engineering model, making it easy to compare alternatives without starting from scratch.
Validate the system before construction begins.
Spreadsheet calculations, supplier tools and manual updates make detailed HVAC design slow to change and difficult to trust. Hysopt continuously validates hydraulic behaviour as your design evolves, so every change updates the complete engineering model automatically.
You'll be able to:
• Validate flows, temperatures and pipe sizing
• Recalculate the entire system instantly after every change
• Eliminate unnecessary rework and oversizing
Digital twin advantage
One engineering model keeps every calculation, component and design decision connected as the project evolves.
Deliver the system exactly as it was engineered.
Design intent is often lost during handover, creating coordination issues, installation changes and unnecessary delays. Hysopt keeps engineering calculations and BIM models aligned so installers build the system that was actually designed.
You'll be able to:
• Reduce coordination errors between engineering and BIM
• Keep installation aligned with validated calculations
• Avoid costly redesigns during construction
Digital twin advantage
The digital twin preserves engineering intent throughout installation, keeping everyone working from the same validated system model.
Commission with confidence the first time.
Incorrect equipment settings and fragmented commissioning information lead to comfort complaints, troubleshooting and expensive recommissioning. Hysopt generates commissioning-ready outputs directly from the validated system model.
You'll be able to:
• Generate accurate commissioning settings
• Reduce first-start issues and call-backs
• Commission faster with greater confidence
Digital twin advantage
Commissioning parameters come directly from the validated digital twin—not isolated calculations or manual assumptions.
Understand how the system performs before making changes.
Once a building is operational, finding the real cause of poor performance is often slow, expensive and based on trial and error. Hysopt predicts system behaviour across seasons, load profiles and control strategies so optimisation decisions are based on evidence.
You'll be able to:
• Predict real-world HVAC performance
• Compare optimisation scenarios before implementation
• Reduce operating cost and improve system efficiency
Digital twin advantage
The same digital twin continues delivering value after handover, helping optimise, troubleshoot and future-proof the system throughout its lifecycle.
Your project changes.
Your engineering model shouldn't.
Follow one validated digital twin from feasibility through operation and make every HVAC decision with greater confidence.
See how Hysopt works in 170 seconds
Understand how engineering teams use Hysopt to compare concepts, validate designs, coordinate BIM, commission systems and predict HVAC performance before construction.
WHY HVAC TEAMS USE HYSOPT
HVAC engineering shouldn't depend on spreadsheets, assumptions and rework
Most HVAC projects still rely on disconnected calculations, supplier tools and manual validation. Hysopt replaces fragmented workflows with one physics-based engineering platform that helps teams make better decisions from feasibility through commissioning.
Reduce oversizing
Replace rules of thumb and stacked safety margins with system-level validation and right-sizing.
Eliminate engineering rework
Update the model once and automatically recalculate the entire system as requirements change.
Prove performance before construction
Identify hydraulic conflicts, control issues and underperformance before they become site problems.
Compare better design alternatives
Evaluate HVAC concepts quickly using consistent CAPEX, OPEX and CO₂ analysis.
Defend engineering decisions
Support recommendations with quantifiable, physics-based evidence instead of assumptions.
One engineering workflow
Keep design, simulation, BIM and commissioning connected through a single digital twin and one source of truth.
Proven on real HVAC projects
Explore a real HVAC project in Hysopt
PROVEN ACROSS BUILDING TYPES, INDUSTRIES & REGIONS
Build for complex hydronic HVAC systems
From new construction to retrofit and decarbonisation, Hysopt helps engineering teams design, validate and optimise complex hydronic HVAC systems across a wide range of project types.
Commercial &
public buildings
Commercial • Healthcare • Education • Residential
Data centres &
energy infrastructure
Data centres • District heating & cooling • Utilities
Industrial &
retrofit projects
Industrial facilities • Retrofit • Decarbonisation • Electrification
Enabling engineering teams across Europe, North America and the Middle East.
SOLUTIONS FOR EVERY STAGE OF HVAC DESIGN, VALIDATION & COMMISSIONING
One platform. Five HVAC engineering applications.
Every application shares the same physics-based hydronic HVAC digital twin—keeping engineering data consistent from feasibility through commissioning.
Reach client-ready HVAC decisions in hours—not weeks.
- Compare HVAC concepts on CAPEX, OPEX & CO₂
- Generate a client-ready Feasibility Pack
Create correct-by-construction hydronic HVAC designs.
- Replace Excel with one physics-based engineering model
- Automatically recalculate the entire system after every change
Predict real-world HVAC performance before construction.
- Simulate seasons, part-load operation and control strategies
- Validate energy, comfort and equipment behaviour
Connect sizing, component selection and commissioning.
- Generate calculated pump & valve presets automatically
- Commission systems right the first time
Keep BIM and engineering calculations perfectly aligned.
- Synchronise BIM and HVAC calculations in real time
- Prevent redesign and revalidation after design changes
Validate your own HVAC system for free
Try it on you own project and see how Hysopt helps identify oversizing, validate performance and uncover optimisation opportunities before construction.
No installation. No credit card. Get started in minutes.
AI-POWERED HVAC ENGINEERING
DeltaT AI: Your built-in HVAC engineering copilot
Get instant answers, troubleshoot engineering issues and understand system behaviour without leaving Hysopt. Grounded in Hysopt's deep HVAC expertise, pro Academy content and knowledge from hundreds of real-world projects.
Resolve issues faster
Understand warnings, hydraulic behaviour and system interactions in seconds.
Find answers instantly
Get contextual answers without searching documentation or interrupting colleagues.
Built for HVAC engineering
Purpose-built for Hysopt users with engineering-focused guidance—not generic AI.
Stay in the flow
Reduce context switching and keep projects moving without leaving your model.
Scale engineering expertise
Give every engineer access to proven HVAC knowledge, best practices and project experience.
Learn while you work
Understand not just what to do, but why—directly inside your workflow.
WHAT HVAC PROFESSIONALS SAY ABOUT HYSOPT
Trusted by engineering teams worldwide
From consultants and contractors to technical directors and building owners, Hysopt helps organisations improve engineering quality, reduce risk and deliver better-performing HVAC systems.
"From insight to supervision with a single Hysopt model. With Hysopt, we identify opportunities to decarbonise the built environment. We then translate those insights into practical solutions during project delivery."
“It’s more trustworthy than Excel — you can easily make mistakes there, while with the software it’s easier to detect faults.”
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“I don’t know any software that does what Hysopt does. We just have to be honest — I haven’t come across it.”
“Hysopt already helped us identify pumps that were either too small or oversized — those are mistakes you really want to catch early.”
“Hysopt has been brilliant — perfect for what we needed. It paid for itself with the very first project.”
“We’re not a typical installation company, and that’s exactly why Hysopt helps us make our designs smarter and more efficient.”
“Hysopt helps us work faster and more accurately. It allows us to back our designs with real data, and that’s something our clients value.”
“I see Hysopt as my Swiss army knife — it allows me to gain insight into the dynamic behaviour of a system very quickly and early in a project.”
"What personally convinced me was the ability to compare multiple system concepts side by side and simulate them dynamically using a Digital Twin."
"The added value of Hysopt lies in its ability to optimize all parts of the hydronic systems and provide all insights needed over the full range of operation."
"Thanks to Hysopt, we're now witnessing consistently high-quality designs emerging from the design team, revolutionising our approach to projects and enhancing our reputation."
"The greatest benefit of using Hysopt is its ability to eliminate uncertainties, allowing us to efficiently and effectively identify and address all system issues."
Learn from 550+ HVAC projects
Access practical HVAC research, benchmark data and engineering guidance developed from real-world projects.
Download the 2026 HVAC Systems Report and discover the trends shaping HVAC design, system performance, energy efficiency and decarbonisation.
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