person hand using laptop computer with house icon energy efficiency scale image office desk concept ecological and bio |
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| navigate by keyword : bar building business certificate chart class classification concept conservation construction consumption cost design diagram eco ecological ecology economic economy effective efficiency efficient electric electricity energy environment environmental graph green hand heating home house icon improvement insulation label man performance person power rating save saving sign symbol technology |
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| Person hand using laptop computer with house icon energy efficiency scale image on office desk, Concept of ecological and bio energetic house. Energy class |
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