A heat capture system

A building surface heat capture system for use in forming an integral part of the envelope of a building, the system comprising a plurality of heat transfer panels locatable as part of the walls of the building, and preferably also the floor and roof surfaces, the panels defining an internal fluid flow path along which fluid can be pumped from a heat exchange unit, the fluid, preferably air, entraining heat which would otherwise leak from the building through the walls/floor/roof, and which heat may then be extracted via the heat exchange unit for re-use.