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ÌýSpecificationCosts (£)Tonnes of CO2 saved
Photovoltaics3.5 kWp25,0001.4
Solar thermal6m28,0000.5
Double glazing1.5W/m2K24,0001.3
Roof insulation 0.15W/m2K6,6003.4
Wall insulation 0.20W/m2K11,0003.3
Leakage reduction Ìý2,6661.0