C80 Retrofit:Measuring is believing

SuperHomer Robert Cohen achieved an 84% reduction in CO2 by renovating his 4 storey 1830s Edwardian terraced house in London. Extensive monitoring in 2011 shows the following:

  • 84% reduction in CO2
  • 1.1 tonnes of CO2 emitted
  • 79% of electricity generated by PV
  • Space heating demand 23 kWh/m2/year

The ‘C80 Retrofit:Measuring is believing‘ report confesses that this result was both helped by complimentary good behaviours such as wearing fleeces in winter and hindered by unhelpful behaviour such as the immersion heater being inadvertently left on for 26 days in August.

The report helpfully illustrates the seasonality of electricity production from PV showing the relatively lean winter months of November to February. It provides useful insights into the appliances in use and their relative energy consumption.

The report also concludes that the Green Deal in its envisaged form may only make a modest contribution to the government’s stated aim of an 80% reduction in CO2 by 2050. Robert’s experience suggests that finance of up to £60,000 is required to upgrade a larger older town house (internal floor area of 121m2) to near PassivHaus standard. Will Green Deal finance stretch this far?

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