Quest Geothermal serves the following areas, among many others across Ontario:
Ajax, Alliston, Aurora, Angus, Barrie, Brampton, Bolton, Brooklyn, Bobcaygeon, Brechin, Caledon, Collingwood, Elmira, Essa, Etobicoke, Fenelon Falls, Georgina, GTA, Innisfil, King City, Keswick, Kawartha Lakes, Lindsay, Markham, Mt. Albert, Newmarket, Nobelton, Oshawa, Orono, Omemee, Orillia, Pickering, Port Perry, Peterborough, Richmond Hill, Stouffville, Stayner, Sutton, Scarborough, Toronto, Thronbury, Whitby, Wasaga Beach, Woodbridge, Uxbridge, Vaughan