Research in England and Wales shows that conservatories, extensions and changing behaviour cancelled out any savings

Conservatories and house extensions could be helping to wipe out the reductions in gas use secured by insulating homes, according to a study that found insulation only provides a short-term fall in energy consumption.

In a surprise finding, the study into the long-term effect of loft and cavity wall insulation in England and Wales showed that the fall in gas consumption for each household was small, with all energy savings disappearing by the fourth year after it had been fitted.

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