Keywords
absence, alternative energy, close-up, color, colored background, covering, energy conservation, energy efficient, environment, environmental awareness, environmental conservation, environmental issues, focus on foreground, fuel and power, grass, green, heat, heater, ideas, ideas and concepts, knob, no people, out of context, photography, radiator, series, side view, single object, studio shot, temperature, thermostat, unknown, vertical, wall, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, 1014041