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A 1930s-style house built in 2008 as part of a University of Nottingham research project is undergoing the first of three energy-efficiency upgrades. The plan is to convert the energy-inefficient house - one of the most sophisticated "research houses" in the world - into a zero-carbon home. The results, according to experts at the School of the Built Environment, will be relevant to millions of people across the UK who occupy similar structures. The house is fitted with more than 100 sensors to monitor energy use, temperature and humidity. It was designed as a typical 1930s-style semi-detached house, complete with open fires, single-glazed windows, inefficient water heating and no insulation.