When the energy generated by PV is included, the PHPP (energy usage calculator) shows an incredible negative annual energy usage of -35kWh/m2.annum. This compares favourably with the total energy (55kWh/m2.annum) a regular Passive House uses for heating (15kWh), lighting (20kWh) and hot water (20kWh).

A Clina ground loop connected to the Under-Floor heating manifold cools the house very efficiently in summer using 10 Degree@ 1m deep ground water. The house was built using the Passive Slab Foundation system and Twin-Wall Timber Frame Construction method with wall, floor and roof U-values of 0.10W/m2.K and Air tightness levels of 0.45ACH@50Pa.

A group of 6 Architects visited this house in Aug 2014, one of them asked how much extra this house cost to build over a traditionally constructed house, when Jeremy showed him his construction costs the architect said "that's 10% cheaper than a traditionally constructed house in this area". This ties in well with our mantra "Make it simpler, make it cheaper, make it better!"

Devon

This Code 6 Social Housing Development of six houses was completed in Devon in 2013/14 on a tricky sloping corner site using stepped Passive Slab foundations. Combining Passive House construction with a Solar PV-T roof enables the houses to generate more energy than they consume.