There are Adjustable Rate Mortgages in the US too. My sister-in-law lost her house a while back where her rate went up. I think they lock you in at a low rate for the first 5 years and then they go up. It sounds like a good idea if you’re confident that rates are going to stay low and your home will increase in value making it easy to refinance. But in reality, no one can predict the market 5 years out, so I wouldn’t recommend it.