I think when we saw the home renovation tax credit, which was running in 2009 in parallel to the retrofit homes program, it was significantly less than that. It doesn't take a lot to incent Canadians to do what is actually the right thing.
The other thing I would mention is the beauty of the EnerGuide rating system, as opposed to just incenting specific products. As well, there's getting a home assessment, because it teaches homeowners what they need to invest in and it gives them a plan over time. They'll want to replace their windows because the insulating glazing is shot and it's all foggy, but they might actually spend a lot less money by insulating their attic. However, they don't know that.
They'll probably do both in the end, because that's the smart thing to do, but that assessment is really critical.