Confused? You will be if you are considering installing energy-saving measures in your home, following the publication of figures from the Energy Saving Trust, which works closely with the government.
This week it revised the savings that can be achieved as a result of measures such as loft insulation or a new boiler.
It had been expected to lower the amounts, but has mystified green experts by upping some of the figures substantially.
Three weeks ago Guardian Money revealed how a study of 21,000 homes tracked by the Department of Energy and Climate Change had suggested the savings claims made by the EST were seriously flawed and in no way borne out by real-life conditions.
An analysis of DECC’s own data suggested the annual savings from installing loft insulation have been around £15.50 a year, compared with the “up to £180” figure promoted by the EST.
The figures are important because they have been widely used in adverts from companies such as British Gas to persuade householders to spend thousands of pounds on replacing an old boiler or paying for other energy efficiency measures. They also form the basis of the government’s Green Deal.