The Interactive Window hair System was a sterling effort by Colt International, aimed at developing an integrated and modular product for use in naturally ventilated buildings. Milton Park Ltd piloted the system in a passive solar building completed for Marston Book Services. How well has the building performed?

The BRE has examined the suitability, effectiveness and potential energy savings of retrofitting natural and low energy ventilation systems in UK offices during refurbishment projects.

A house without a heating system in our cold climate - is it possible? In each of Goteborg, Malmo and possibly also in Hannover, about 20 terrace houses which are so energy efficient that they need no special system for heating are under construction. The Swedish Council for Building Research (BFR) is providing financial assistance.