Availability of fossil fuels became readily and abundantly available during the mid to latter part of the 20th century, and building design responded with mechanical and electrical systems that in many instances consumed the fuel excessively. Large single glazed areas caused over-heating, glare and solar discomfort in the summer, combined with cold draughts and high heat losses in the winter. Thermostatic control was often rudimentary and compensated by opening and closing windows accordingly. The industry has responded, and buildings are now designed to be sustainable, energy conscious and environmentally friendly. Inevitably this has changed the image of the industry professionals from those that run pipes or cables from one place to.
