The Home Energy Audit: Where Your Energy Goes and How to Reduce It
Most households could reduce their energy bills and carbon footprint by 20–30% through relatively painless changes. Here is where to look first.
The average UK household emits approximately 2.7 tonnes of CO₂ equivalent per year from domestic energy use. The average energy bill is approximately £2,000 annually. Both are substantially reducible through changes that require no capital expenditure — purely behavioural — and further reducible with modest investment in efficiency measures.
The No-Cost Changes
Heating temperature. Turning your thermostat down by 1°C reduces heating bills by approximately 10%. Most households heat to 20–21°C; 18–19°C is recommended by most health bodies for adults in good health and is imperceptible after brief adaptation.
Heating timing. Heating an empty house during the day is the most common source of heating waste. A programmable thermostat or smart thermostat costs £30–100 and pays back in weeks.
Standby power. UK homes waste approximately £35 per year on devices left on standby. This is small money but a habit worth changing: power strips with switches allow easy shutdowns at day end.
Washing temperature. 90% of a washing machine's energy use goes to heating water. Washing at 30°C rather than 40°C reduces energy use by approximately 40% per wash. Modern detergents work well at 30°C.
Low-Cost Investments
Draught proofing. One of the highest return-on-investment home improvements available. Sealing gaps around doors, windows, and floorboards costs under £50 in materials and reduces heating loss by 15–20%. DIY-accessible.
LED lighting. LED bulbs use 90% less energy than incandescent and 60% less than halogen. A full-house swap costs £50–100 and pays back typically within one year.
Shower timer. Showers account for approximately 25% of household water and heating energy. Reducing average shower time from 8 minutes to 4–5 minutes has a measurable impact on both bills and carbon footprint.
The most sustainable home is not a new one with expensive technology. It is an existing one whose occupants have examined their habits.
