18th century building becomes a low-energy modern house

18th century building becomes a low-energy modern house

Homeowners Anne and Patrick Jordan’s ambitious upgrade and extension project in County Kildare took the shell of an 18th century farmhouse and transformed it into an elegant family home with a striking-yet-sensitive modern extension — all while embracing a healthy and fabric-first approach to retrofit combined with clever heating system design that has brought them from a G to an A3 rating.

Ventilation duties for both the new and old buildings are courtesy of a decentralised LUNOS heat recovery ventilation system – a solution that enables low energy ventilation without running ductwork. The large house requires a dozen LUNOS e2 decentralised heat recovery ventilation units, a LUNOS ego HRV unit and thee low energy extract fans.


Project type: Retrofitted 200 sqm rubble-built house (dating from c.1730) with approx 200 sqm cavity wall extension to the rear

Architects: Maxwell Pierce and Mesh Architects
Contractor: Pat Doran Construction
Location: Kildare, Ireland
Building: Single-Family house
Completion: 2017

Ventilation system supplied: Lunos decentralised demand-controlled heat recovery system throughout. 12 x Lunos e2 units, 1 x Lunos ego, and 3 x low energy extract fans.

Final calculated efficiency relative to the house: 85.22% (according to DiBT) / 73.22% (according to the Passive House Institute). Overall volume flow: 195 m3/hr. Specific power consumption of heat recovery units: 0.10 W/m3/hr.

Read the complete article here: PassiveHousePlus