In floor heating is a great form of heat the only draw back is that if you want to work in the garage side and raise the temperature in a hurry it’s not the answer. It does take a while to raise the temperature because of the way it works. A hanging heater would heat the space faster. That said if you open a over head door the infloor reheats the space faster due to the fact your entire floor is acting as a radiator. It’s a matter of deciding what your trying to do with the space. I would recommend even if you don’t plan on using infloor heat in the garage to install the tubing so its atleast an option down the road.