3,172 kWh - electricity from 8-Jun-2017 to 16-Jun-2018
7,049 kWh - gas from 8-Jun-2017 to 16-Jun-2018 (635m3 x 11.1 conversion factor)
Compared to a typical national market estimate for an average household of 5,300kWh electricity and 13,800kWh (source: bonkers.ie)
Our annual usage 2015-16:
3,024 kWh - electricity from 23-Jul-2015 to 21-Jul-2016
6,100 kWh - gas from 22-Dec-2015 to 22-Dec-2016
Use the SEAI BEH self assessment survey (link). Result: No recommendations. The house already has:
- Solar hot water heating for hot water cylinder.
- High efficiency condensing gas boiler system for primary heating and hot water.
- > 4 inches of glass fibre ceiling insulation in the attic.
- Mixed Solid Wall and Hollow Block and Timber Frame construction.
Checklist the SEAI credits list (pdf file, link).
Own plan as follows:
- Replace halogen low voltage MR16 bulbs/transformers with GU10 high efficiency LED bulbs on direct 240v supply.
- Fit additional ceiling insulation in the attic.
- Complete upgrade of windows and front door (street side, North facing).
- Fit shutter blinds to internal window frames.
- Computer logging of internal temperature, electricity supply, weather station data.
- Conduct thermal survey of the house.
Our goal, perhaps unrealisable, is to get near the Passivhaus requirement for energy-consumption of 120 W/m²/K.
References:
Passive House on Wikipedia (link)
W/m²/K is Watts per square metre per kelvin; see Wikipedia on thermal transmittance (link)
