New houses are built with energy efficiency in mind, the cavities between the outside walls are wider to allow more insulation to packed in to the space which keeps the cold out and warmth in, in real terms this means your house will stay warmer so you are not paying for the heat to simply escape through the walls and your new house once heated will stay warmer for longer.
Older houses typically have these cavities so heat will escape through the walls and to keep the internal temperature up the heating will be on for much longer periods because the house will cool very quickly once the heating is turned off.
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