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** ''Buildings'' sector: Most fossil fuel use is for heating. While it's true that electric heat pumps ''could'' be more efficient, the majority of heating is in locations/seasons too cold for any efficiency gain for heat pumps. | ** ''Buildings'' sector: Most fossil fuel use is for heating. While it's true that electric heat pumps ''could'' be more efficient, the majority of heating is in locations/seasons too cold for any efficiency gain for heat pumps. | ||
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The | The estimate could be an ''over''estimate if... | ||
* increased heat pump usage, cold weather heat pump breakthrough | * increased heat pump usage, cold weather heat pump breakthrough | ||
The | The estimate could be an ''under''estimate if... | ||
* energy storage losses become significant | * energy storage losses become significant | ||
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