Temperature Set Points (1 degree C)

Review heating set points and reducing temperatures by 1 degree Celsius wherever possible (via a Building Management System, for example) reduces the demand for heat, and thereby gas consumption.

Estimates for the costs and savings associated with this technology were taken from the previous MACC calculations in 2010.

The cost and carbon savings associated with expected reductions in kWh consumption were extrapolated over time using the cost and carbon intensity projections provided by the DECC/HM Treasury Green Book guidance on valuing energy use and greenhouse gas emissions.

The resulting figures were sense checked by stakeholders with experience of building energy efficiency interventions.

Case study sources

NHS Energy Efficiency Fund Report

Green Book supplementary guidance: valuation of energy use and greenhouse gas emissions for appraisal

Financial Calculations


Energy savings were normalised using the energy spend of the NHS trust from which the various data sources were taken. This gave an average saving of £90,000 annually per trust based on the gas costs in 2015. Values were extrapolated over time using costs from the Treasury Green Book guidance.


Average capital costs per NHS trust normalised by energy spend were taken as £5,000, representing a cost associated with checking and maintaining the change in set point.

Carbon Calculations

Average carbon savings per trust were calculated using carbon intensity projections from the DECC/HM Treasury Green Book guidance. In 2015, the carbon savings derived from the expected kWh savings were 800 tCO2 per annum for NHS Trusts.