People looking to compare energy tariffs and find a cheap gas supplier may be hoping they can boost their efficiency rating next year by taking advantage of the Green Deal.
However, one consumer group has queried whether the discounts that will be available will be as large as previously stated, as the calculations have been made using averages rather than actual usage.
Which? warned that as a result of this, people may not have confidence that the programme will work as effectively for them as has been claimed.
Executive director at the organisation Richard Lloyd said: "The Golden Rule was supposed to reassure people that Green Deal repayments would not exceed the savings made on energy bills. But if this is based on average figures then it could be meaningless for many."
According to findings from the Department of Energy and Climate Change's consultation into the proposals, 46 per cent of people say they would be more encouraged to improve their home's energy efficiency if it leads to reduced costs, while a third would be tempted by the offer of financial assistance.
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