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Draught proof windows and doors

Boiler upgrade score: 4/5 cost, 2/5 energy saving
British Gas; image of a modern boiler
If you can feel cold air around any of your windows or doors, it means warm air is escaping. Heat loss through draughts can account for as much as 20% of your total heating costs. Install draught proofing, and you could cut your bills by around £20 a year - and your annual carbon emissions by 155kg.
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