HARPENDEN
CASE STUDY
PHIT THE BILL ALL ELECTRIC RETROFIT MAY TURN A PROFIT IN ENERGY CRISIS A passive house, by its nature, requires a much smaller amount of energy than a typical home, and when its heating demand is met by electricity, and you cover it in solar PV panels, you can start to see the potential for a whole new generation of passive homes that are semi-independent of the electricity grid. This is the case for Carrstone House in Bedfordshire, which generates so much solar energy it had to be registered as a power station. By David W Smith
IN BRIEF Building: : Deep retrofit & extension of 151 m2 detached 1960s house Method: External wood fibre insulation, timber frame, air-to-water heat pump Location: Harpenden, Hertfordshire Standard: Enerphit Plus (certified) Heating cost: £23/month* * Based on monitored energy use for space heating – adjusted to current UK energy price cap and ignoring PV reduction. See ‘In detail’ panel for more information.
£23 per month
52 | passivehouseplus.ie | issue 43