A group of butterflies is called a kaleidoscope, and as visitors to Chester Zoo's Butterfly Journey make their way through the hundreds of exotic plants with the distant sound of a waterfall, the beautiful, colorful butterflies – some with wingspans of up to 30cm – fly freely around them. With all the colors and movement, it can feel as though you’re walking through a kaleidoscopic rainforest of Latin America or Southeast Asia, and now, all the heating is provided by renewable Ecodan air source heat pumps – a sustainable heating technology.