Thermal performance is a major issue in contemporary design, with buildings employing large expanses of glazing; great for light, bright work spaces but also prone to glare and overheated interiors. Current buildings typically use energy intensive air conditioning systems and can often be working alongside mechanical shading in the form of blinds or louvres. Proposed system provides the same benefits as mechanical shading, and so can reduce air conditioning use by up to 25%, yet without many of the drawbacks. The active liquid facade is a passive but reactive shading system which is easy to maintain, doesn’t require human interaction or electrical input and can be easily retrofitted on existing buildings. The system works by utilising the thermal expansion properties of liquids, contained within glazing panels, to provide shading capable of responding to changing temperatures. Small wells of liquid within the windows are heated when exposed to sunlight, causing the liquid to expand and rise within a capillary network in the glass.