case study A heat recovery with mechanical ventilation (MVHR) system has helped a self-build couple avoid increases in their heating bills, even when they built a house three times the size. That has been a huge achievement as the owners of the 4000 square foot, award winning timber frame eco-home had previously lived in a two bedroom bungalow. The MVHR system helped the couple avoid any increase in heating bills because it recovers over 90 per c

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