Rapid Overnight Thermal Performance Test

Measure and verify heat loss in 12 hours or less

Veritherm is a unique and unrivalled testing solution that is used to measure the thermal performance of buildings.

Rather than using existing heat loss assessments which rely on simple visual inspections, our fast and reliable measurement technique provides real-world data to give a far better understanding of the actual amount of energy that is lost through the thermal envelope of a building.



With an elegant mix of advanced mathematics, low cost testing and a highly scalable digital platform, the Veritherm technology has revolutionised in-situ thermal performance measurement.

How it works
Slide 1
Stage 1: Planning

Relevant design information, such as EPCs and energy assessments, is gathered and entered on our software platform.
We use this to see how the measured performance compares with its theoretical design.

We will also plan for the test to be carried out, considering access and any building or weather constraints.

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Stage 2: Preparation

One of our certified engineers will attend the property to set up the equipment and run pre-test checks.

Fans and heaters attached to smart plugs are placed to ensure there is an even mix of heat spread across the building, and the loggers will record the temperatures throughout the test.

The engineer is now able to leave the property as the software platform takes control of the test from this point

Slide 1
Stage 3: Measurement

The Veritherm test takes place overnight and is activated by our software platform. A measured heating load is applied to the building during the first phase, before the building is left to passively cool during the second phase.

The system measures the internal and external temperatures every minute, with the data being sent automatically to the Veritherm platform, where they can be viewed in real-time.

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Stage 4: Validation / Outputs

As soon as the test completes at sunrise, the results are available in the form of a summary certificate, together with a full report which provides a breakdown of the data. These will give you a thermal performance rating, the amount of heat that is lost through the fabric (expressed in watts per kelvin), an understanding of the measured performance compared to the designed performance (ie the performance gap) and an average U-Value for the building.

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The Benefits of Using Veritherm


It is carried out in a single overnight test


From £500 +VAT per property


Our intelligent system performs all the calculations


 The automated process provides immediate and quantitative results


 Minimal disruption for occupants


 The process has been fully validated

Veritherm testing is being used by many different types of clients


From £500


Per  dwelling


Testing service includes:

12 hour In-situ Thermal Performance Test

Test Report & Certification

Delivery Partners

We have a network of certified delivery partners that have been trained to deliver this service,
so wherever you are in the UK, you can benefit from Veritherm testing.

HLS Property Services (2)
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What is Veritherm Testing?

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How does it work?

Discover More

To find out more about our monitoring
services, please download our brochure