I am almost positive that you do not have to pay
taxes to the US Feds on income you generate if you rent a property in the US.
In time, we will rent out the property I am sure - but only to folk we know since there are very stringent rules where we purchased on who we rent to. They will rent it for us but require a criminal record check to any renters that they rent to. We are free to rent to people we know. Very secure place and that is something we need since we won't be there that much for a couple of years yet. Still working full time so it will be a vacation home for now.
I think if you sell you pay everything to Canada as you won't have a big enough income to qualify for US
taxes, I wouldn't think as you have to write off your expenses and unless you bought years ago and have paid off everything, your income vs expenses should not be that great. Could be wrong, but will look into it. If you come across anything, would be most than welcome to hear fro yu or anyone else that does know.
As a side, the mortgage rates (if you need one) are higher if you are going to use it as a rental property (okay to let your friends/family use it for a nominal fee of helping with expenses).