Older units are limited in energy efficiency than the newer air-con models. Commercial industries require severalair conditioning units and small savings in efficiency can certainly make a large difference in the electricity bills. The energy efficiency ratings for air-con units range from grades G to A, where A is the most potent one. Commercial air conditioning specialists consider aair-con unit more efficient if not only wastes less energy and lowers your bills, and do not cause any negative environmental impact. While the large, expensive systems are only purchased for offices and the home owners now enjoy the relief from the heat with the affordable air conditioning systems available. Renew Air is the leading air-con company that focuses on the conjugation services like air conditioning installation and repairing of all kinds of air condition units.