HVAC Engineering Software That Helps You Make Better Decisions Earlier
Design, compare, validate and optimise hydronic HVAC systems using a single physics-based digital twin. Replace fragmented spreadsheets, disconnected calculations and engineering assumptions with a workflow that proves HVAC performance before construction begins.
Whether you're evaluating concepts, designing systems, coordinating BIM models or commissioning equipment, Hysopt gives engineering teams one consistent way to make better decisions throughout the HVAC project lifecycle.
Used on +550 HVAC projects worldwide.
The hidden cost of traditional HVAC engineering
Most HVAC teams don't struggle because they lack expertise.
They struggle because engineering decisions are spread across spreadsheets, supplier tools, BIM models and disconnected calculations. Every design change creates more rework. Every assumption introduces more uncertainty. Every project handover increases the risk of losing engineering intent.
The consequences show up later:
• Oversized equipment and unnecessary CAPEX
• Design changes that trigger days of revalidation
• Commissioning issues that should have been prevented
• Higher operating costs than expected
• Performance gaps discovered after installation
• Engineering decisions that are difficult to defend
The problem isn't engineering capability.
It's fragmented engineering workflows.
One engineering model.
Every HVAC decision.
Most HVAC software solves individual tasks. Hysopt connects feasibility, design, simulation, BIM coordination and commissioning through one physics-based digital twin.
Every calculation, performance prediction and commissioning setting comes from the same engineering model. The result is fewer assumptions, less rework and better engineering decisions throughout the project lifecycle.
One model
No duplicated calculations across different project stages.
One single source of truth
Design, simulation, BIM and commissioning remain aligned.
One engineering workflow
Less rework, fewer errors and greater confidence in every decision.
Better HVAC decisions create better project outcomes
Hysopt isn't designed to help engineers do the same work faster. It's designed to help engineering teams make better decisions.
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.
Results achieved by Hysopt users
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
See Hysopt in action
See how engineering teams use Hysopt to compare concepts, validate hydronic designs, predict system performance and generate commissioning-ready outputs.
A different standard for HVAC engineering
They need a better way to make engineering decisions.
- Manual updates across multiple files
- Revalidation required in every tool
- Update once and the entire system recalculates
- Rules of thumb and assumptions
- Data spread across multiple tools
- Physics-based evidence from one engineering model
- Slow and difficult
- Separate calculations for every option
- Compare alternatives consistently in hours
- Not possible
- Separate simulation workflow
- Simulate operation before construction
- Safety margins accumulate
- Limited system visibility
- System-level validation and right-sizing
- Manual checking
- Design intent drifts over time
- One-click synchronisation and validation
- Manual calculations and spreadsheets
- Fragmented commissioning data
- Presets derived from the full system model
- Depends on senior engineers
- Knowledge remains trapped in silos
- Standardised templates, workflows and engineering methods
- Difficult
- Information gets lost between handovers
- One digital twin from feasibility to operation
- Different tools for different phases
- Rebuild work at every stage
- One continuous engineering workflow
Hysopt replaces spreadsheets, isolated tools and repeated revalidation with one physics-based digital twin that stays consistent from feasibility through operation.
Try Hysopt on a real HVAC system
Used by engineering teams on +550 HVAC projects worldwide.
Ready to objectify Feasibility in 1–2 Hours?
Choose the right Hysopt application for your HVAC engineering workflow
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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."
Explore our resources
The Waterfront Project: Energy Recuperation in Vancouver
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Maximising Heat Pump Efficiency
The State of HVAC 2026
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.
Join the Hysopt Academy
Learn how to use the Hysopt software, and gain advanced knowledge on the latest HVAC technologies.
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