Received EIGHT calls from this number just today (Aug11) in Toronto.  There is a Facebook post that emerged on a google search with a warning about these guys.  Said that they were scammers pretending to be from Enbridge and/or saying they were "Green Energy".  The poster confirmed that they were not authorized by Enbridge.  Other comments on this post indicated that people had called from this number and said they were coming for a pre-arranged furnace and/or AC inspection.