David Manning has a four-bedroom 26-year-old detached family house in Dundonald, Belfast. The home is heated by an oil-fired boiler. One day, Mr Manning, who is a school headmaster, was looking at ways of improving the energy efficiency of his home and was thinking about installing an energy management system. He looked at HeatingSave and two other products but decided to install a HeatingSave Building Energy Management System because it did a lot more than the competitor systems and was very good value for money.