Energy Consulting Firms
how to measure u value

U-value measurement for energy consulting firms


This document provides the reader with an overview of U-value measurement solutions for energy consulting firms.


Heat flux sensor technology suited for energy consultancy


energy consultancy firms

It can be difficult to find the right energy consultancy company that suits your application and that can provide you an in-depth understanding of your project. It can be complex for energy consultancy firms to provide or find the right measuring technology to support the development of a project.

At greenTEG, we provide a range of products suited to provide reliable and robust heat flux measurement, U-value and R-value measurement, ambient and surface temperature.

greenTEG’s gSKIN U-Value Measurement Solutions can be used in-situ, and are compatible with ISO-9869 and ASTM C1046/C1155.

ISO 9869-1:2014 is a norm which describes the measurement method to obtain the thermal properties of building elements using a heat flow meter. In most cases, the most important thermal value is the thermal transmittance, or U-Value, some countries also may require the thermal Resistance, R.

This ISO norm goes into great detail about the measurement apparatus to be used, the calibration procedure for the apparatus, the installation and the measurement procedures, the analysis of the data, and the reporting format. Fortunately, greenTEG has designed its Building Measurement Systems in full compliance with this ISO-norm. In the other U-Value measurement methods, a minimum temperature difference of 15ºC is needed between indoor and outdoor environments. Since greenTEG uses highly sensitive heat flux sensors, only a temperature difference of 5ºC is required. There are many criteria to an ISO compliant U-Value measurement, here are a few examples:

  • Minimum temperature difference between inside and outside environment of 5ºC
  • Minimum measurement period of 72 hours
  • The U-Value in the first 2/3rds of the measurement cannot deviate by more than 5% to the U-Value in the latter 2/3rds of the measurement
  • The U-Value in the final 24hrs cannot deviate by more than 5% to the U-Value taken over the entire period

This is just a sample of the criteria required for a proper U-Value measurement to be taken. Luckily, greenTEG’s software does all of this for you, and even indicates ISO compliance with a report generator!


Energy Consulting Firms
Example of report with ISO compliance included on top of other sets of data

greenTEG’s solutions for energy consultancy


As an energy consultant, your job is to install the system correctly and make an appropriate decision with the U-Value you have obtained. Upon purchasing a system from greenTEG, we can guide you in correctly installing our system, with our technical documents, manuals, and introductory call.

The U-Value kit is used for a wide range of Industrial solutions, ranging from Retrofitting, Building Energy Compliance to testing novel construction materials.

greenTEG’s also offers the second generation of its system for Wireless U-Value and R-Value assessment, scalable to 5 measurement points per system. This wireless measurement system is perfect for energy expenditure, building envelope energy efficiency or building insulation assessment. This all-in-one device is suited for a broad range of building energy consumption setups.

Determine wirelessly and simultaneously:

  • The U-value of various building elements: Double glazing, windows, walls, roof, floor, façade.
  • The U-value of multiple construction materials: glass, brick, wood, Phase Change Materials (PCM), concrete and cavity wall!
goms II

U-Value Roof
Roof U-value measurement
how to measure u value
Full building U-value measurement
U-value insulation
Window U-value measurement

Evaluate your energy expenditure from simple insulation building measurement to industrial or environmental climate chambers. Contact us for more information.


A range of use cases to help energy consultancy firms




  • Watch some videos about U-value available here!
  • All the peer-reviewed publications can be found here.