Two homes with floor area 320m2 each with 150mm cavity, internally insulated plasterboard in Co. Galway. Floors: 0.19 W/m2K Walls: 0.15 W/m2K Roof: 0.16 W/m2K Rooflights: 0.81 W/m2K Windows (overall u-value): 1.0 W/m2K. Installed is Compact P with UVP5 (5KW Outdoor Air-to-Water heat pump) connected to zoned underfloor heating circuits and NiLAIR ducting system.