Measuring energy performance of homes

Accurate energy performance ratings

The thermal performance test gives an indication of the true performance of the building that can be directly compared with the predicted performance. Our system is built on 10 years of academic research and has been tested and validated by 3rd parties and in hundreds of buildings.

Process for measuring thermal performance of a house

  1. Gather building information

    Basic building information such as location, floor area, attachment type, heating system and window type are gathered via a brief property survey or from existing building plans.

    These can be entered directly into our online system using a mobile phone or recorded offline for later entry.

    Floor plan and laser disto
  2. Collect energy consumption data

    Gas and electricity consumption is required which can either be collected using manual meter readings or smart meter data.

    Manual meter readings require somebody to record the consumption at the service meters at both the start and end of the 3-week test period.

    Alternatively, half-hourly smart meter data can be obtained with the homeowner's consent and uploaded when calculating the result.

    Reading a gas meter
  3. Monitor internal temperatures

    One or more discreet temperature sensors are temporarily placed around the house to measure the internal temperature and humidity over a 3-week period. Up to 10 temperatures sensors are supported to cover houses of all sizes.

    Where smart thermostats are already installed in the property, it may be possible to retrieve the temperature data directly from the device.

    Because the measurement is of the heat loss rate from the property, there must be heat loss to measure. For that reason, there must be a mean daily internal-external temperature difference of at least 7oC, so that the measurement must be carried out during a heating season.

    Basic temperature sensor
    Nest smart thermostat
  4. Upload data to online system

    At the end of the 3-week measurement period, temperature sensors are retrieved and readings are downloaded.

    All the gathered building information, energy data and temperature readings are uploaded to our secure online system from where a Heat Transfer Coefficient will be calculated along with an energy rating.

    File upload on a laptop
  5. Generate an online test report

    Optionally, an online report can be generated and presented to the homeowner.

    Where a baseline test was performed prior to energy-saving works being carried out, any rating improvement will serve to validate the performance improvement and quality assurance of the works.

    SmartHTC results screen