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inefficient 
Incandescent light bulb efficiency, Sankey diagram
Rights Managed 
Incandescent light bulb efficiency, Sankey diagram
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Heat loss from a house, illustration
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People in meeting trying to build model railway blindfold
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Thermogram of an AC adapter
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Thermogram of an AC adapter
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Sprinkler irrigation
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Sprinkler irrigation
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Contraception icons, illustration
Royalty Free 
Conceptual illustration of technical difficulties
Royalty Free 
Domestic washing machine
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Leaking stand pipe
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Incandescent light bulb
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Incandescent light bulb
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Incandescent light bulb
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Incandescent light bulb
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Frost on Bedroom Window, Poor Insulation
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Fridge with open door
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Swimmer draped in a towel, thermogram
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Buckingham Palace, thermogram
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Thermogram of AC Adapters
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Thermogram of AC Adapters
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Thermogram of AC Adapters
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Thermogram of AC Adapters
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Buckingham Palace, thermogram
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