Describes the Low Energy Office (LEO) of the UK Building Research Establishment, among the first buildings in the UK to be designed with the aim of minimising energy use. State the LEO was refurbished during summer 1988 to allow an independent assessment of the concepts associated with electrical heating in highly insulated, naturally ventilated buildings. Information from the 1988/89 heating season will be used to develop guidance on factors associated with electric heating, such as the optimum control strategy, emitter-sizing criteria and occupant factors. Presents the results obtained so far.

KEYWORDS: Electric heating, natural ventilation, offices, UK, research, all electric.