Hysopt Designer: Physics-Based HVAC Design Software That Gets It Right the First Time

Replace fragmented spreadsheets with one connected engineering workflow that automatically calculates, validates and updates hydronic HVAC systems as your design evolves.

‍Design complete HVAC systems using Hysopt's physics-based digital twin to reduce oversizing, eliminate engineering rework and validate hydraulic performance before construction begins.

Launch your Hysopt Designer demo Start your free trial

What is the Hysopt Designer?

Hysopt Designer is physics-based HVAC design software for engineers who need to deliver hydronic HVAC systems that work as intended—not just on paper, but in the real world.

Instead of managing disconnected spreadsheets and manual calculations, Designer connects P&IDs, hydraulic calculations, pipe sizing, flow, temperature propagation and system validation in one digital twin. Every engineering calculation stays synchronised automatically as the design evolves.

Powered by Hysopt's physics-based hydronic HVAC digital twin, Designer helps engineering teams reduce oversizing, eliminate rework and confidently validate system performance before construction begins.

See the Hysopt Designer in action

Read Groep Infrabo's story on how they eliminate errors

Main features of the Hysopt Designer

Intuitive P&ID modelling

Build HVAC systems faster—and keep them correct as they evolve.

Design complete hydronic HVAC systems using a visual P&ID workflow instead of disconnected spreadsheets. Create, modify and expand designs quickly while every calculation stays connected to the same physics-based digital twin.

Hydraulic validation

Detect engineering issues before they become site problems.
‍
Automatically identify missing components, hydraulic conflicts and design inconsistencies while you work. Catch errors early, reduce oversizing and avoid costly redesigns before construction begins.

Power, flow & temperature propagation

Calculate the entire HVAC system automatically.
‍
Every design change instantly recalculates flow rates, temperatures and energy balances across the complete hydronic system. Spend less time checking calculations and more time making better engineering decisions.

Pipe sizing

Right-size every pipe with confidence.
‍
Automatically size piping using recognised engineering standards and project-specific design criteria. Reduce unnecessary material costs while maintaining hydraulic performance across the entire HVAC system.

Proven concepts library

Start from proven HVAC system designs—not a blank page.
‍
Accelerate HVAC design using a library of validated energy centre concepts with integrated control strategies. Reuse engineering best practices, standardise designs across teams and deliver projects faster with greater confidence.

Autodesk AECO Strategic Partner

Hysopt brings BIM and physics-based HVAC simulation closer together, so teams can right-size plant, cut energy & CO₂, and reduce rework from P&ID to BIM.

Read the partnership story

Frequently asked questions

What is HVAC design software?

HVAC design software helps engineers design, calculate and validate heating and cooling systems before construction. Hysopt Designer replaces fragmented spreadsheets with a physics-based digital twin that automatically recalculates the entire hydronic HVAC system as designs evolve.

How is Hysopt Designer different from Excel?

Unlike Excel, Hysopt Designer keeps every calculation connected to a single engineering model. When project requirements change, the entire HVAC system updates automatically—eliminating manual recalculation, copy-paste errors and inconsistent assumptions.

What is hydronic HVAC design?

Hydronic HVAC design is the process of designing heating and cooling systems that distribute energy using water. Hysopt Designer enables engineers to model, calculate and validate complete hydronic systems, including flow rates, temperatures, pressures and component sizing.

How does Hysopt Designer reduce engineering rework?

Every calculation is connected to the same physics-based digital twin. When a design changes, Hysopt automatically updates flows, temperatures, pipe sizing and hydraulic calculations, removing the need to manually rebuild spreadsheets or repeat calculations.

How does Hysopt reduce oversizing?

Instead of relying on stacked safety margins and engineering assumptions, Hysopt validates the complete hydronic HVAC system. Engineers can right-size pumps, pipes, valves and production equipment using system-level calculations and hydraulic validation.

Can Hysopt automatically size HVAC pipes?

Yes. Hysopt automatically sizes HVAC piping using recognised engineering standards and project-specific design criteria. Engineers can optimise pipe dimensions based on flow velocity, pressure loss or custom design requirements.

Does Hysopt perform hydraulic validation?

Yes. Hysopt continuously validates the hydraulic behaviour of the HVAC system while you design. It automatically detects missing components, redundant components and hydraulic inconsistencies before construction begins.

What happens when project requirements change?

Update the model once and Hysopt automatically recalculates the entire HVAC system. Flows, temperatures, pressures, pipe sizing and hydraulic behaviour remain synchronised without manual rework.

Can Hysopt integrate with BIM workflows?

Yes. Hysopt Designer integrates with Hysopt BIM Syncer, allowing engineering calculations and BIM models to remain aligned throughout the project lifecycle while preserving engineering intent.

Which HVAC projects is Hysopt Designer suitable for?

Hysopt Designer supports commercial buildings, hospitals, education campuses, residential developments, industrial facilities, data centres, district heating and cooling networks, and retrofit or decarbonisation projects.

Who is Hysopt Designer built for?

Hysopt Designer is built for HVAC engineers, MEP consultants, design-build contractors and technical engineering teams responsible for designing, validating and documenting hydronic HVAC systems.

Why use a physics-based digital twin for HVAC design?

A physics-based digital twin keeps every HVAC calculation connected within one engineering model. This gives engineers greater confidence in system sizing, hydraulic performance and design decisions while reducing oversizing, engineering rework and project risk.

What is correct-by-construction HVAC design?

Correct-by-construction HVAC design means the engineering model stays technically consistent as the project evolves. Instead of checking calculations after every change, Hysopt automatically maintains flows, temperatures, pressures and component sizing throughout the design process.

Explore our resources

View all

Webinar

Adressing the Pressing Challenges in Today's HVAC Industry

Stay ahead of the curve with Hysopt's physics-based HVAC engineering software

Webinar

Discover the Renewed Hysopt Inspiration Library

We're excited to invite you to an exclusive webinar to discover our new and improved Hysopt Inspiration Library. With over 70 new templates of proven & validated concepts, implemented by our Hysopt Expert Centre, we aim at making your HVAC engineering process even more efficient and effective.

Blog

HVAC Talk of the Week: Calculating Design Flows

Join our Energy Engineer Ruben as he delves into the captivating world of design flows, and discusses why it's important to compute them correctly.

Ready to engineer HVAC systems with greater confidence?

Reduce oversizing • Eliminate rework • Defend design decisions • Predict performance before construction

Design, validate, simulate and optimise hydronic HVAC systems using one physics-based digital twin.

Book your personal demo Start your free trial

Join the Hysopt Academy

Learn how to use the Hysopt software, and gain advanced knowledge on the latest HVAC technologies.
Get tutored by our in-house experts online, in real-life or on demand.

Join our Academy

The State of HVAC 2026