Building methods are improving every year giving us better insulated buildings which in turn lead to lower energy costs. Sometimes it's hard to see where we are making these improvements, but just compare a house that was built 40 years ago and compare it to a modern house built to the latest building regulations. One can see pretty quickly how much easier it is to heat a modern house and how much better a modern house will retain heat, why is this? The obvious and the main reason is that houses are now built with better insulation; new modern materials help retain heat in the building and therefore reduce energy costs. In combination with better insulation, new building methods have given us a more air tight structure. This is important because controlling the air circulation is just as important if not more important than insulation one's house.
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