The water filtration experts at Green Approved Solutions are here to help you. Green Approved Solutions has the most highly trained HVAC specialists serving Toronto and the surrounding areas to upgrade their heating and cooling systems to be more energy efficient. G.A.S. also works with multiple auditors, accredited by Enbridge, to get homeowners the maximum Enbridge and OPA (Ontario Power Authority) rebate checks up to $2200 for upgrading their appliances to be more energy efficient.