Sketch of one of UK most airtight homes at 0.11 ach – Heat Space and Light Ltd 2021 Published 8 March 2021 at 1139 × 710 in Cotswold new build is 55x more airtight than Building Regs and 3x more airtight than Passivhaus Sketch of one of UK most airtight homes at 0.11 ach – Heat Space and Light Ltd 2021 ← Previous Next →