The title is stolen from a CarsonDunlop report. If you are looking for a good summary of all the grants currently available for doing energy efficient upgrades (furnace, air conditioner, insulation, windows, even toidies !), you may want to start at a good CarsonDunlop page .... http://www.carsondunlop.com/ecoenergy/rebates.html
As you will see, it's not just the feds giving grants. The Province, provincial and municipal electric utilities, Toronto Water, and gas utilities are all giving loot out in different ways for different things. It's your money, go get it!
Nothing is exactly free here -- all will require a pile of your money too. But they make the changes easier and will save you money every month on your utility bills while doing less damage to our one-and-only world.
By the way, we are just completing our training and will become certified "NAGAB" green agents. It doesn't mean we will show up with a hammer, but we will have a lot of information to help you determine what you might be buying or what you should consider doing.
[UPDATE: ANOTHER GOOD PLACE TO CHECK OUT THE FED/PROVINCIAL OPTIONS: http://www.homeenergyontario.ca/]