The scammers can scam in part because there was real and very lucrative program available from Natural Resources Canada that paid you up to $5000 to put in a heat pump, solar panels, windows or new insulation. That ended at the beginning of February. In Ontario, Enbridge supplemented that program, so those on Enbridge could get up to $10,000 total. There will be a new program announced in Ontario, through Enbridge over the next month, but it won't be as rich. You do need to have a professional energy assessment to take advantage of these programs. Scammers come around with something that sounds like the legit program, but is not. Just go on the government websites if you are not sure if it is real or scam.
There is also a $10,000 interest free 10yr loan still available from the Federal Government (through CMHC) that you can use for energy savings, and again, you need the energy audit. Scammers never mention that! I'll answer questions if you have any.