Retrofit case study demonstrating energy savings and increased quality of life (comfort conditions). The LTH system will be evaluated by multiple connection scenarios with HP, e.g. with inverter HP running by partial loads to minimize the energy bills and maximize advantages of LTH storage effect.

GEOFIT Pilot in Aran Islands (Ireland)

Manager: CFO
Main industrial partners involved: IDP, ILECO, OCHS, COMS, UPO, R2M
Innovation Level:  2


  • Location: Aran Islands, Ireland
  • Typology/use: Residential / Dwelling
  • Year of construction:  1922 (new parts have been constructed afterwards)
  • Area: 117 m2
  • GEOFIT area: the whole house
  • Climate condition: North temperate climate
  • Existing HVAC system: 21 kW diesel boiler (for both heating and DHW) and coal stove. 9 aluminium radiators with individual on/off control.
  • Geological data: karst limestone with very shallow soil
  • Total energy consumption: electricity 45.784 kWh; gasoil 11.722,2 kWh (about 1.100l); coal 20.668 kWh.
  • Previous retrofitting works: –


  • Simulation and demand modelling: to be determined
  • Drilling/excavation: improved vertical drilling
  • Nr of bh: 1 or 2 (TBC); Depth of bh: 120
  • Building monitoring during drilling phase:-
  • Ground source heat pump: commercial electrically driven HP (first estimates ≈ 6kW). HP operational control system integrated.
  • Operation strategy: GSHP should cover base load and coal stove only used for peak demand
  • Retrofitting proposed: envelope insulation and LTH geothermal system (floor heating + ventilation + heat recovery). The LTH system is featured with high modularity with extreme low height design, which provides users with space savings and easy installation.
  • BEMS: Intelligent layer on top of the ecoSCADA GW already installed during pre-intervention phase.