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heating × 83energy-efficiency × 15
energy × 14
home × 10
water-heating × 8
electricity × 7
solar-thermal × 4
natural-gas × 4
water × 3
carbon-footprint × 3
cooling × 3
air-conditioning × 3
building-physics × 3
building × 3
ventilation × 3
fireplace × 3
recycling × 2
solar-power × 2
renewables × 2
ecological-footprint × 2
alternatives × 2
fuel-efficiency × 2
greenhouse-gas-emissions × 2
energy-management × 2
oil × 2
