Safeguarding historic documents and other artefacts requires stable building conditions. Until now this was usually achieved with the expensive and energy-hogging use of heating and cooling equipment, but a new approach by Herefordshire Council used the passive house approach to conserve energy, money — and the county’s precious historical archives.

Most energy upgrades to historic homes in architectural conservation zones take a fairly gentle approach to insulation and airtightness — this one did the exact opposite.

Sustainable building pioneers The Green Register will run a new half-day seminar in London on 27 June 2014 entitled ‘Achieving energy efficiency and preserving historic buildings - surely too good to be true?’