But homeowners often also do a more comprehensive energy audit that includes analysis of heating and cooling.

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You can read an analysis of the plan prepared by the Alaska Legislative Budget and Audit Committee here (downloads as a pdf).

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Mr Hague announced the "comprehensive audit" in July, saying it would provide "the most thorough and detailed analysis possible on the extent of EU powers" and valuable guidance for policy-makers in the future.

BBC: UK government begins 'comprehensive' audit of EU powers