*Offer is only available to ACT residents who upgrade an existing natural gas ducted heating system with a new 6-star high efficiency ducted natural gas system with eligible ductwork through an approved retailer. ^Annual running costs/savings based on Sustainability Victoria’s running costs/savings for a 2-star 160m2 sized house in a cold climate adjusted for Canberra’s climate and ACT 2017/18 gas tariff of 3.1141 c/MJ, assuming that the thermostat is set between 18 - 20 degrees Celsius. Actual costs for your house will depend on the area heated, how long you run the heating for, your thermostat setting and how well your house is insulated. Offer is effective for quotes accepted from 10 May 2017. See our full terms and conditions. ActewAGL Retail ABN 46 221 314 841 a partnership of Icon Retail Investments Ltd ABN 23 074 371 207 and AGL ACT Retail Investments Pty Ltd ABN 53 093 631 586.