DUMAVA 2026: How to ensure your HVAC design actually performs

The DUMAVA scheme will reopen on June 1, making €405 million available for the renovation and decarbonisation of public and non-profit buildings in the Netherlands. For many organisations, this is the ideal moment to accelerate projects and improve energy performance.

But there is a critical risk that is often overlooked.

Securing funding does not automatically mean that an HVAC system will perform as expected.

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Where DUMAVA projects often go wrong

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In practice, many renovation projects start with the right intentions but fall short due to technical assumptions that do not hold up in reality.

Common issues include:

Oversized systems leading to inefficient energy use
Overestimated energy savings
Lack of insight into the full hydraulic system
Designs that work in theory but fail in practice

These challenges directly impact building performance — and ultimately the return on investment and credibility of the subsidy application.

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Why traditional calculations fall short

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Many HVAC designs are still based on static calculations and simplified assumptions. While these methods are fast, they fail to capture:

Interactions between system components
Variations in load conditions (part load vs peak load)
Hydraulic imbalance in complex systems

As a result, systems may comply on paper but underperform in real operation.

And that is exactly where the risk lies in DUMAVA projects.

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From subsidy application to real performance

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To make a DUMAVA project successful, it is not enough to select the right measures — you also need to demonstrate that they will work within the full system.

This requires a different approach.

By simulating HVAC systems at system level, you gain insight into:

Actual energy flows
Interactions between components
Behaviour under different operating conditions

This allows decisions to be based on validated performance rather than assumptions.

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How Hysopt supports this process

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Hysopt enables teams to model and simulate HVAC systems in a physically accurate way before implementation.

This helps project teams to:

Avoid oversizing and correctly dimension systems
Substantiate realistic energy savings
Validate design choices through simulation
Identify risks early in the design phase

In the context of DUMAVA, this means you are not only submitting a subsidy application, but also ensuring that the design behind it will perform as intended.

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Getting started with your DUMAVA project

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Are you preparing a DUMAVA application or starting a renovation project?

It is essential to look beyond individual measures and understand how they behave within the full HVAC system.

A structured approach helps you to:

Substantiate design decisions
Detect issues early
Increase the likelihood of successful project delivery

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FAQ: DUMAVA and HVAC design

What is DUMAVA?

DUMAVA is a Dutch subsidy scheme that supports organisations in improving the energy performance of public and non-profit buildings. The focus is on energy savings and CO₂ reduction through renovation measures.

Why is HVAC design critical in DUMAVA projects?

HVAC systems have a major impact on a building’s energy consumption. Design or sizing errors can lead to underperformance, reducing the effectiveness of both the investment and the expected energy savings.

How does simulation improve a subsidy application?

Simulation allows you to demonstrate how an HVAC system will perform in real conditions. This leads to more accurate calculations, stronger justification of energy savings, and reduced risk of underperformance after implementation.

Want to ensure your DUMAVA project not only secures funding, but also delivers real performance?

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Download the checklist and learn how to technically validate your HVAC design before implementation.

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