I will post my experience I had tonight and let those reading judge.
I had a young man come to my door. He said he was from 'Ontario Energy' and needed to come inside to make sure my furnace and air conditioner met the new efficiency standards. He literally started moving toward my open door as though he was going to walk into my house. I blocked his path, stepped onto the front porch, closed the door behind me. I knew right away he was using aggressive and misleading tactics, and I questioned him about his company and who he represented. He couldn't answer consistently, quickly got flustered and told me I could speak to his Manager. Only then did I notice the man standing at the edge of my property. Knowing full well these people would be going along the street preying on some of my elderly neighbours, I went toward the mystery man and asked him his name. He refused to tell me and actually told me to go back in my house if I wasn't interested. Since I don't take kindly to any bullying, I argued with him a bit. After insulting me a few times he reached around and patted me on the back twice in a mocking / demeaning way. Mr. Mystery no name man didn't realize that touching me equals assault and that I have a brown belt in jiu-jitsu. He was quickly pinned and restrained, I warned him that if he touched me again I would defend myself further and charge him with assault, then i released him. They walked away, the one yelling back that he would 'destroy me'. I quickly went inside to grab my cell phone, called 911, and followed them up the street. They were parked about a block away, got into a white BMW and sped off. Unfortunately i didn't get a complete license plate. Police attended the scene, I gave them a report, they told me to call 911 if I ever spotted them again, I've alerted my neighbours and hopefully these guys were shaken up enough to change a bit.
In hindsight, the biggest problem I have with these people isn't whether they'll scam me, it is that I know they are just looking for the easy target to prey on. I agree that we are at a point now where no reputable company, charity, or other group should be knocking on doors soliciting anything. No reputable company should be doing it, and 99% no longer do.
So Ontario Energy Group, in my opinion, is an organization that no one should ever deal with. There is enough convincing evidence online to back up my opinion, they don't even list a location of any kind on their website, and they employ people and practices that are questionable at best.