... Easy installation, Strong adaptability, reliable, Famous compre solar air-conditioning specifications:9000BTU,12000BTU,18000BTU,20000BTU24000BTU,36000BTU,41000BTU,48000BTU.......Why ... medium by using a vacuum solar collector. The refrigeration from the compressor goes through the copper coil ... the collector and undertakes a heat exchange. The refrigeration exchanges heat with the medium inside the solar ...