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Female engineer holding an energy-saving light bulb against windmills.
Efficiency levels knob button. Increasing Efficiency Level. Wireframe hand turning a efficiency test knob to the maximum position. Development and growth business concept. Vector illustration.
Energy efficiency icon set. Calculator, energy-saving light bulb, piggy bank, solar panel, circular economy, battery, home insulation, energy class vector illustration
Engineer adjusting thermostat for efficient automated heating system
Hands are holding coins for saving and energy saving home, eco energy saving home concept and environmentally friendly home.

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