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Degree Days for Energy Management – Carbon Trust


A guide, published by the Carbon Trust, on analysing heating energy consumption against weather.

Further description

This guide shows how to use degree days to:

  • Monitor the effect of changes in heating system operation on consumption more easily by removing the effect of weather.
  • Calculate realistic heating budgets for a particular building based on its performance.
  • Degree Day data can be obtained free of charge from www.degreedaysforfree.co.uk

Where can it be found

Carbon Trust


Wiltshire Council, Green Economy Team

Devon County Council, Environment Group

How it has been used to date

At Wiltshire Council this has been to provide the theory of degree day data to enable users of the iMeasure tool to understand how the weather correction is calculated.

At Devon County Council this tool was used as an introduction to train building facilities managers about degree days to help them better manage energy consumption and plan for its costs.

User Experience

Clearly explains the concept of degree day analysis and how to use them to your advantage.

The process is time consuming and there are systems like imeasure to create the graphs automatically.

Degree day analysis will only be effective if meter readings taken on the last day of the month to align with degree day data collected, so best used with automatic meters. When used with schools, because the colder months are only part occupied, the resulting graphs show anomalies.

Target audience

Energy Managers and Facilities Managers.