Defining energy efficiency involves consideration of several different approaches but covers a wide range of energy consumption indicators.

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Not all plans or special offers are available at all times, or in all areas. Ground source heat pumps can be even more energy-efficient and cost-effective.

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You can use Uswitch to filter by what's important to you, whether that's a large supplier or one that offers green energy plans.

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The EU set itself a 20% energy savings target by 2020 compared to 1990 levels, but member states decide individually how energy savings will be achieved.

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